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188 relations: Active electronically scanned array, Acute radiation syndrome, Alexander Gurwitsch, Alexis Clairaut, Antenna (radio), Anthropic principle, Apparent magnitude, Apsidal precession, Atmospheric focusing, Attenuation, Audio signal flow, Bertrand's theorem, Binet equation, Call volume (telecommunications), Candlepower, Cannabis cultivation, Central force, Christiaan Huygens, Circumstellar habitable zone, Classical central-force problem, Classical field theory, Colonization of Mars, Comparison of Chernobyl and other radioactivity releases, Constant of motion, Copernican heliocentrism, Cosmic distance ladder, Coulomb collision, Coulomb's law, Dark Energy Survey, David Watkin (cinematographer), Dipole antenna, Distance decay, Distance modulus, Divergence theorem, Earnshaw's theorem, Effects of nuclear explosions, Electric charge, Electric field, Electricity, Electromagnetic radiation, Electron, Electron scattering, Entropic gravity, Equivalence principle, Euler's three-body problem, Ewald summation, Extraterrestrial skies, Field (physics), Fifth force, Flash (photography), ..., Flux, Force, Forced perspective, Free-air gravity anomaly, Gain before feedback, Gain stage, Gauss's law, Gauss's law for gravity, Gaussian units, Gravitational constant, Gravitational potential, Gravity, Gravity of Earth, Gravity-gradient stabilization, Great comet, Grow light, Henri Poincaré, History of electrochemistry, History of gravitational theory, History of Maxwell's equations, History of the philosophy of field theory, Hyperbola, Index of electronics articles, Index of optics articles, Indoor positioning system, Inductionism, Intensity (physics), Intercontinental ballistic missile, Intrinsic brightness, Inverse care law, Inverse square potential, Inverse-square law, Ionizing radiation, Ionospheric absorption, Ismaël Bullialdus, Johannes Kepler, John Dumbleton, Joseph Priestley, Kepler problem, Knot energy, Laplace's equation, Laplace–Runge–Lenz vector, Laser Inertial Fusion Energy, Last mile, Liouville dynamical system, List of Dutch inventions and discoveries, List of eponymous laws, List of important publications in physics, List of scientific publications by Albert Einstein, Long Range Acoustic Device, Long-range locator, Lorentz force, Lotka's law, Low-probability-of-intercept radar, Luminosity, Magnetic field, Malmquist bias, Marcel Vogel, Martin Nowak, Mechanical explanations of gravitation, Mid-Canada Line, Missile Gap, Near and far field, Near–far problem, Newton's law of universal gravitation, Newton's theorem of revolving orbits, Non-ionizing radiation, Non-line-of-sight propagation, Nuclear blackout, Nuclear fusion, Observational history of comets, Orb (optics), Orbit, Orbit equation, Parabolic cylindrical coordinates, Parapsychology, Photometry (astronomy), Physical cosmology, Physical law, Planck units, Point particle, Point source, Polar coordinate system, Potential energy, Power law, Pre-emptive nuclear strike, Probability Moon, Proximity effect (audio), Psychokinesis, Radar, Radar astronomy, Radiant intensity, Radiation, Radiation pressure, Radiation protection, Radio, Radio propagation, Radiolocation, Ramanath Cowsik, Rayleigh–Plesset equation, Renormalization, Richard Helsham, Robert Hooke, RR Lyrae, Rutherford scattering, Satellite television, Scientific Revolution, Shell theorem, Skyglow, Solar constant, Sonar, Soundproofing, Space colonization, Spacecraft magnetometer, Spaghettification, Specific radiative intensity, Square (algebra), Steam whistle, Strong gravity, Sun, Sunlight, Surface gravity, Tide, Timeline of black hole physics, Timeline of fundamental physics discoveries, Timeline of theoretical physics, Two-body problem in general relativity, Udwadia–Kalaba equation, Venus, Virtual particle, Voyager 2, Voyager program, Wave equation, Waveguide, Whispering-gallery wave, Wireless electronic devices and health, Wireless network, 54 Piscium. Expand index (138 more) »
Active electronically scanned array
An active electronically scanned array (AESA), is a type of phased array antenna, that is a computer-controlled array antenna in which the beam of radio waves can be electronically steered to point in different directions without moving the antenna.
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Acute radiation syndrome
Acute radiation syndrome (ARS) is a collection of health effects that are present within 24 hours of exposure to high doses of ionizing radiation.
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Alexander Gurwitsch
Alexander Gavrilovich Gurwitsch (also Gurvich, Gurvitch; Алекса́ндр Гаври́лович Гу́рвич; 1874–1954) was a Russian and Soviet biologist and medical scientist who originated the morphogenetic field theory and discovered the biophoton.
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Alexis Clairaut
Alexis Claude Clairaut (13 May 1713 – 17 May 1765) was a French mathematician, astronomer, and geophysicist.
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Antenna (radio)
In radio, an antenna is the interface between radio waves propagating through space and electric currents moving in metal conductors, used with a transmitter or receiver.
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Anthropic principle
The anthropic principle is a philosophical consideration that observations of the universe must be compatible with the conscious and sapient life that observes it.
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Apparent magnitude
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
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Apsidal precession
In celestial mechanics, apsidal precession or orbital precession is the precession (rotation) of the orbit of a celestial body.
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Atmospheric focusing
Atmospheric focusing is a phenomenon occurring when a large shock wave is produced in the atmosphere, as in a nuclear explosion or large extraterrestrial object impact.
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Attenuation
In physics, attenuation or, in some contexts, extinction is the gradual loss of flux intensity through a medium.
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Audio signal flow
Audio signal flow is the path an audio signal takes from source to output.
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Bertrand's theorem
In classical mechanics, Bertrand's theorem states that among central force potentials with bound orbits, there are only two types of central force potentials with the property that all bound orbits are also closed orbits: (1) an inverse-square central force such as the gravitational or electrostatic potential and (2) the radial harmonic oscillator potential The theorem was discovered by and named for the French mathematician Joseph Bertrand (1822-1900).
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Binet equation
The Binet equation, derived by Jacques Philippe Marie Binet, provides the form of a central force given the shape of the orbital motion in plane polar coordinates.
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Call volume (telecommunications)
In telecommunications, call volume refers to the number of telephone calls made during a certain time period.
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Candlepower
Candlepower (abbreviated as cp or CP) is an obsolete unit expressing luminous intensity, equal to 0.981 candelas.
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Cannabis cultivation
This article presents common techniques and facts regarding the cultivation of the flowering plant Cannabis, primarily for the production and consumption of cannabis flowers ("buds").
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Central force
In classical mechanics, a central force on an object is a force that is directed along the line joining the object and the origin: where \scriptstyle \vec is the force, F is a vector valued force function, F is a scalar valued force function, r is the position vector, ||r|| is its length, and \scriptstyle \hat.
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Christiaan Huygens
Christiaan Huygens (Hugenius; 14 April 1629 – 8 July 1695) was a Dutch physicist, mathematician, astronomer and inventor, who is widely regarded as one of the greatest scientists of all time and a major figure in the scientific revolution.
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Circumstellar habitable zone
In astronomy and astrobiology, the circumstellar habitable zone (CHZ), or simply the habitable zone, is the range of orbits around a star within which a planetary surface can support liquid water given sufficient atmospheric pressure.
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Classical central-force problem
In classical mechanics, the central-force problem is to determine the motion of a particle under the influence of a single central force.
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Classical field theory
A classical field theory is a physical theory that predicts how one or more physical fields interact with matter through field equations.
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Colonization of Mars
Mars is the focus of much scientific study about possible human colonization.
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Comparison of Chernobyl and other radioactivity releases
This article compares the radioactivity release and decay from the Chernobyl disaster with various other events which involved a release of uncontrolled radioactivity.
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Constant of motion
In mechanics, a constant of motion is a quantity that is conserved throughout the motion, imposing in effect a constraint on the motion.
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Copernican heliocentrism
Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543.
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Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects.
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Coulomb collision
A Coulomb collision is a binary elastic collision between two charged particles interacting through their own electric field.
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Coulomb's law
Coulomb's law, or Coulomb's inverse-square law, is a law of physics for quantifying the amount of force with which stationary electrically charged particles repel or attract each other.
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Dark Energy Survey
The Dark Energy Survey (DES) is a visible and near-infrared survey that aims to probe the dynamics of the expansion of the Universe and the growth of large-scale structure.
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David Watkin (cinematographer)
David Watkin BSC (23 March 1925 – 19 February 2008) was a British cinematographer, an innovator who was among the first directors of photography to experiment heavily with the usage of bounce light as a soft light source.
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Dipole antenna
In radio and telecommunications a dipole antenna or doublet is the simplest and most widely used class of antenna.
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Distance decay
Distance decay is a geographical term which describes the effect of distance on cultural or spatial interactions.
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Distance modulus
The distance modulus is a way of expressing distances that is often used in astronomy.
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Divergence theorem
In vector calculus, the divergence theorem, also known as Gauss's theorem or Ostrogradsky's theorem, reprinted in is a result that relates the flow (that is, flux) of a vector field through a surface to the behavior of the vector field inside the surface.
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Earnshaw's theorem
Earnshaw's theorem states that a collection of point charges cannot be maintained in a stable stationary equilibrium configuration solely by the electrostatic interaction of the charges.
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Effects of nuclear explosions
The energy released from a nuclear weapon detonated in the troposphere can be divided into four basic categories.
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Electric charge
Electric charge is the physical property of matter that causes it to experience a force when placed in an electromagnetic field.
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Electric field
An electric field is a vector field surrounding an electric charge that exerts force on other charges, attracting or repelling them.
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Electricity
Electricity is the set of physical phenomena associated with the presence and motion of electric charge.
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Electromagnetic radiation
In physics, electromagnetic radiation (EM radiation or EMR) refers to the waves (or their quanta, photons) of the electromagnetic field, propagating (radiating) through space-time, carrying electromagnetic radiant energy.
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Electron
The electron is a subatomic particle, symbol or, whose electric charge is negative one elementary charge.
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Electron scattering
Electron scattering occurs when electrons are deviated from their original trajectory.
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Entropic gravity
Entropic gravity, also known as emergent gravity, is a theory in modern physics that describes gravity as an entropic force—a force with macro-scale homogeneity but which is subject to quantum-level disorder—and not a fundamental interaction.
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Equivalence principle
In the theory of general relativity, the equivalence principle is any of several related concepts dealing with the equivalence of gravitational and inertial mass, and to Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (such as the Earth) is the same as the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference.
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Euler's three-body problem
In physics and astronomy, Euler's three-body problem is to solve for the motion of a particle that is acted upon by the gravitational field of two other point masses that are fixed in space.
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Ewald summation
Ewald summation, named after Paul Peter Ewald, is a method for computing long-range interactions (e.g., electrostatic interactions) in periodic systems.
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Extraterrestrial skies
In astronomy, an extraterrestrial sky is a view of outer space from the surface of a world other than Earth.
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Field (physics)
In physics, a field is a physical quantity, represented by a number or tensor, that has a value for each point in space and time.
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Fifth force
In physics, the fifth force is a proposed fundamental force, additional to the four known fundamental forces of nature.
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Flash (photography)
A flash is a device used in photography producing a flash of artificial light (typically 1/1000 to 1/200 of a second) at a color temperature of about 5500 K to help illuminate a scene.
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Flux
Flux describes the quantity which passes through a surface or substance.
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Force
In physics, a force is any interaction that, when unopposed, will change the motion of an object.
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Forced perspective
Forced perspective is a technique which employs optical illusion to make an object appear farther away, closer, larger or smaller than it actually is.
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Free-air gravity anomaly
In geophysics, the free-air gravity anomaly, often simply called the free-air anomaly, is the measured gravity anomaly after a free-air correction is applied to correct for the elevation at which a measurement is made.
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Gain before feedback
In live sound mixing, gain before feedback (GBF) is a practical measure of how much a microphone can be amplified in a sound reinforcement system before causing audio feedback.
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Gain stage
In audio engineering, a gain stage is a point during an audio signal flow that the engineer can make adjustments to the level,Thompson, Dan (2005).
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Gauss's law
In physics, Gauss's law, also known as Gauss's flux theorem, is a law relating the distribution of electric charge to the resulting electric field.
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Gauss's law for gravity
In physics, Gauss's law for gravity, also known as Gauss's flux theorem for gravity, is a law of physics that is essentially equivalent to Newton's law of universal gravitation.
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Gaussian units
Gaussian units constitute a metric system of physical units.
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Gravitational constant
The gravitational constant (also known as the "universal gravitational constant", the "Newtonian constant of gravitation", or the "Cavendish gravitational constant"), denoted by the letter, is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.
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Gravitational potential
In classical mechanics, the gravitational potential at a location is equal to the work (energy transferred) per unit mass that would be needed to move the object from a fixed reference location to the location of the object.
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Gravity
Gravity, or gravitation, is a natural phenomenon by which all things with mass or energy—including planets, stars, galaxies, and even light—are brought toward (or gravitate toward) one another.
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Gravity of Earth
The gravity of Earth, which is denoted by, refers to the acceleration that is imparted to objects due to the distribution of mass within Earth.
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Gravity-gradient stabilization
Gravity-gradient stabilization (a.k.a. "tidal stabilization") is a method of stabilizing artificial satellites or space tethers in a fixed orientation using only the orbited body's mass distribution and gravitational field.
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Great comet
A great comet is a comet that becomes exceptionally bright.
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Grow light
A grow light or plant light is an artificial light source, generally an electric light, designed to stimulate plant growth by emitting a light appropriate for photosynthesis.
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Henri Poincaré
Jules Henri Poincaré (29 April 1854 – 17 July 1912) was a French mathematician, theoretical physicist, engineer, and philosopher of science.
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History of electrochemistry
Electrochemistry, a branch of chemistry, went through several changes during its evolution from early principles related to magnets in the early 16th and 17th centuries, to complex theories involving conductivity, electric charge and mathematical methods.
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History of gravitational theory
In physics, theories of gravitation postulate mechanisms of interaction governing the movements of bodies with mass.
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History of Maxwell's equations
In electromagnetism, one of the fundamental fields of physics, the introduction of Maxwell's equations (mainly in "A Dynamical Theory of the Electromagnetic Field") was one of the most important aggregations of empirical facts in the history of physics.
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History of the philosophy of field theory
Field theory had its origins in the 18th century in a mathematical formulation of Newtonian mechanics, but it was seen as deficient as it implied action at a distance.
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Hyperbola
In mathematics, a hyperbola (plural hyperbolas or hyperbolae) is a type of smooth curve lying in a plane, defined by its geometric properties or by equations for which it is the solution set.
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Index of electronics articles
This is an index of articles relating to electronics and electricity or natural electricity and things that run on electricity and things that use or conduct electricity.
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Index of optics articles
Optics is the branch of physics which involves the behavior and properties of light, including its interactions with matter and the construction of instruments that use or detect it.
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Indoor positioning system
An indoor positioning system (IPS) is a system to locate objects or people inside a building using lights, radio waves, magnetic fields, acoustic signals, or other sensory information collected by mobile devices.
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Inductionism
Inductionism is the scientific philosophy where laws are "induced" from sets of data.
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Intensity (physics)
In physics, intensity is the power transferred per unit area, where the area is measured on the plane perpendicular to the direction of propagation of the energy.
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Intercontinental ballistic missile
An intercontinental ballistic missile (ICBM) is a guided ballistic missile with a minimum range of primarily designed for nuclear weapons delivery (delivering one or more thermonuclear warheads).
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Intrinsic brightness
Astronomers use the term intrinsic brightness to refer to how bright a star would be without the effects of distance or absorption due to interstellar dust or gas.
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Inverse care law
The inverse care law is the principle that the availability of good medical or social care tends to vary inversely with the need of the population served.
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Inverse square potential
In quantum mechanics, the inverse square potential is a form of a central force potential which has the unusual property of the eigenstates of the corresponding Hamiltonian operator remaining eigenstates in a scaling of all cartesian coordinates by the same constant.
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Inverse-square law
The inverse-square law, in physics, is any physical law stating that a specified physical quantity or intensity is inversely proportional to the square of the distance from the source of that physical quantity.
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Ionizing radiation
Ionizing radiation (ionising radiation) is radiation that carries enough energy to liberate electrons from atoms or molecules, thereby ionizing them.
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Ionospheric absorption
Ionospheric absorption (or ISAB) is the scientific name for absorption occurring as a result of the interaction between various types of electromagnetic waves and the free electrons in the ionosphere, which can interfere with radio transmissions.
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Ismaël Bullialdus
Ismaël Bullialdus (born Ismaël Boulliau,; 28 September 1605 – 25 November 1694) was a 17th-century French astronomer and mathematician who was also interested in history, theology, classical studies, and philology.
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Johannes Kepler
Johannes Kepler (December 27, 1571 – November 15, 1630) was a German mathematician, astronomer, and astrologer.
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John Dumbleton
John of Dumbleton (Latin Ioannes De Dumbleton; c. 1310 – c. 1349) was a member of the Dumbleton village community in Gloucestershire, a southwestern county in England.
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Joseph Priestley
Joseph Priestley FRS (– 6 February 1804) was an 18th-century English Separatist theologian, natural philosopher, chemist, innovative grammarian, multi-subject educator, and liberal political theorist who published over 150 works.
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Kepler problem
In classical mechanics, the Kepler problem is a special case of the two-body problem, in which the two bodies interact by a central force F that varies in strength as the inverse square of the distance r between them.
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Knot energy
In physical knot theory, a knot energy is a functional on the space of all knot conformations.
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Laplace's equation
In mathematics, Laplace's equation is a second-order partial differential equation named after Pierre-Simon Laplace who first studied its properties.
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Laplace–Runge–Lenz vector
In classical mechanics, the Laplace–Runge–Lenz vector (or simply the LRL vector) is a vector used chiefly to describe the shape and orientation of the orbit of one astronomical body around another, such as a planet revolving around a star.
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Laser Inertial Fusion Energy
LIFE, short for Laser Inertial Fusion Energy, was a fusion energy effort run at Lawrence Livermore National Laboratory between 2008 and 2013.
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Last mile
The last mile or last kilometer is a colloquial phrase widely used in the telecommunications, cable television and internet industries to refer to the final leg of the telecommunications networks that deliver telecommunication services to retail end-users (customers).
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Liouville dynamical system
In classical mechanics, a Liouville dynamical system is an exactly soluble dynamical system in which the kinetic energy T and potential energy V can be expressed in terms of the s generalized coordinates q as follows: T.
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List of Dutch inventions and discoveries
The Netherlands had a considerable part in the making of modern society.
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List of eponymous laws
This list of eponymous laws provides links to articles on laws, principles, adages, and other succinct observations or predictions named after a person.
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List of important publications in physics
This is a list of important publications in physics, organized by field.
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List of scientific publications by Albert Einstein
Albert Einstein (1879–1955) was a renowned theoretical physicist of the 20th century, best known for his theories of special relativity and general relativity.
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Long Range Acoustic Device
The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by LRAD Corporation to send messages and warning tones over longer distances or at higher volume than normal loudspeakers.
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Long-range locator
A long-range locator is a class of devices purported to be a type of metal detector, supposedly able to detect a variety of substances, including gold, drugs and explosives; most are said to operate on a principle of resonance with the material being detected.
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Lorentz force
In physics (particularly in electromagnetism) the Lorentz force is the combination of electric and magnetic force on a point charge due to electromagnetic fields.
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Lotka's law
Lotka's law, named after Alfred J. Lotka, is one of a variety of special applications of Zipf's law.
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Low-probability-of-intercept radar
A low-probability-of-intercept radar (LPIR) is a Radar which use measures to avoid detection by passive radar detection equipment (such as a radar warning receiver – RWR, or Electronic Support receiver) while it is searching for a target or engaged in target tracking.
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Luminosity
In astronomy, luminosity is the total amount of energy emitted per unit of time by a star, galaxy, or other astronomical object.
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Magnetic field
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.
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Malmquist bias
The Malmquist bias is an effect in observational astronomy which leads to the preferential detection of intrinsically bright objects.
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Marcel Vogel
Marcel Joseph Vogel (April 14, 1917 – February 12, 1991) was a research scientist working at the IBM San Jose Research Center for 27 years.
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Martin Nowak
Martin Andreas Nowak (born April 7, 1965) is the Professor of Biology and Mathematics and Director of the Program for Evolutionary Dynamics at Harvard University.
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Mechanical explanations of gravitation
Mechanical explanations of gravitation (or kinetic theories of gravitation) are attempts to explain the action of gravity by aid of basic mechanical processes, such as pressure forces caused by pushes, without the use of any action at a distance.
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Mid-Canada Line
The Mid-Canada Line (MCL), also known as the McGill Fence, was a line of radar stations running east-west across the middle of Canada, used to provide early warning of a Soviet bomber attack on North America.
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Missile Gap
"Missile Gap" is a 2006 English language science fiction novella, originally published in the anthology One Million A.D. by British author Charles Stross.
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Near and far field
The near field and far field are regions of the electromagnetic field (EM) around an object, such as a transmitting antenna, or the result of radiation scattering off an object.
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Near–far problem
The near–far problem or hearability problem is a situation that is common in wireless communication systems, in particular, CDMA.
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Newton's law of universal gravitation
Newton's law of universal gravitation states that a particle attracts every other particle in the universe with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers.
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Newton's theorem of revolving orbits
In classical mechanics, Newton's theorem of revolving orbits identifies the type of central force needed to multiply the angular speed of a particle by a factor k without affecting its radial motion (Figures 1 and 2).
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Non-ionizing radiation
Non-ionizing (or non-ionising) radiation refers to any type of electromagnetic radiation that does not carry enough energy per quantum (photon energy) to ionize atoms or molecules—that is, to completely remove an electron from an atom or molecule.
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Non-line-of-sight propagation
Non-line-of-sight (NLOS) and near-line-of-sight are radio transmissions across a path that is partially obstructed, usually by a physical object in the innermost Fresnel zone.
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Nuclear blackout
Nuclear blackout, also known as fireball blackout or radar blackout, is an effect caused by explosions of nuclear weapons that disturbs radio communications and causes radar systems to be blacked out or heavily refracted so they can no longer be used for accurate tracking and guidance.
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Nuclear fusion
In nuclear physics, nuclear fusion is a reaction in which two or more atomic nuclei come close enough to form one or more different atomic nuclei and subatomic particles (neutrons or protons).
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Observational history of comets
Comets have been observed by humanity for thousands of years, but it is only in the past few centuries that they have been studied as astronomical phenomena.
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Orb (optics)
In photography, an orb is a typically circular artifact on an image, created as a result of flash photography illuminating a mote of dust or other particle.
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Orbit
In physics, an orbit is the gravitationally curved trajectory of an object, such as the trajectory of a planet around a star or a natural satellite around a planet.
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Orbit equation
In astrodynamics an orbit equation defines the path of orbiting body m_2\,\! around central body m_1\,\! relative to m_1\,\!, without specifying position as a function of time.
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Parabolic cylindrical coordinates
In mathematics, parabolic cylindrical coordinates are a three-dimensional orthogonal coordinate system that results from projecting the two-dimensional parabolic coordinate system in the perpendicular z-direction.
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Parapsychology
Parapsychology is the study of paranormal and psychic phenomena which include telepathy, precognition, clairvoyance, psychokinesis, near-death experiences, reincarnation, apparitional experiences, and other paranormal claims.
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Photometry (astronomy)
Photometry is a technique of astronomy concerned with measuring the flux, or intensity of an astronomical object's electromagnetic radiation.
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Physical cosmology
Physical cosmology is the study of the largest-scale structures and dynamics of the Universe and is concerned with fundamental questions about its origin, structure, evolution, and ultimate fate.
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Physical law
A physical law or scientific law is a theoretical statement "inferred from particular facts, applicable to a defined group or class of phenomena, and expressible by the statement that a particular phenomenon always occurs if certain conditions be present." Physical laws are typically conclusions based on repeated scientific experiments and observations over many years and which have become accepted universally within the scientific community.
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Planck units
In particle physics and physical cosmology, Planck units are a set of units of measurement defined exclusively in terms of five universal physical constants, in such a manner that these five physical constants take on the numerical value of 1 when expressed in terms of these units.
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Point particle
A point particle (ideal particle or point-like particle, often spelled pointlike particle) is an idealization of particles heavily used in physics.
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Point source
A point source is a single identifiable localised source of something.
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Polar coordinate system
In mathematics, the polar coordinate system is a two-dimensional coordinate system in which each point on a plane is determined by a distance from a reference point and an angle from a reference direction.
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Potential energy
In physics, potential energy is the energy possessed by an object because of its position relative to other objects, stresses within itself, its electric charge, or other factors.
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Power law
In statistics, a power law is a functional relationship between two quantities, where a relative change in one quantity results in a proportional relative change in the other quantity, independent of the initial size of those quantities: one quantity varies as a power of another.
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Pre-emptive nuclear strike
In nuclear strategy, a first strike is a preemptive surprise attack employing overwhelming force.
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Probability Moon
Probability Moon is a 2000 science fiction novel by American writer Nancy Kress.
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Proximity effect (audio)
The proximity effect in audio is an increase in bass or low frequency response when a sound source is close to a directional or cardioid microphone.
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Psychokinesis
Psychokinesis (from Greek ψυχή "mind" and κίνησις "movement"), or telekinesis (from τηλε- "far off" and κίνηση "movement"), is an alleged psychic ability allowing a person to influence a physical system without physical interaction. Psychokinesis experiments have historically been criticized for lack of proper controls and repeatability. There is no convincing evidence that psychokinesis is a real phenomenon, and the topic is generally regarded as pseudoscience.
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Radar
Radar is an object-detection system that uses radio waves to determine the range, angle, or velocity of objects.
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Radar astronomy
Radar astronomy is a technique of observing nearby astronomical objects by reflecting microwaves off target objects and analyzing the reflections.
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Radiant intensity
In radiometry, radiant intensity is the radiant flux emitted, reflected, transmitted or received, per unit solid angle, and spectral intensity is the radiant intensity per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
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Radiation
In physics, radiation is the emission or transmission of energy in the form of waves or particles through space or through a material medium.
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Radiation pressure
Radiation pressure is the pressure exerted upon any surface due to the exchange of momentum between the object and the electromagnetic field.
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Radiation protection
Radiation protection, sometimes known as radiological protection, is defined by the International Atomic Energy Agency (IAEA) as "The protection of people from harmful effects of exposure to ionizing radiation, and the means for achieving this".
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Radio
Radio is the technology of using radio waves to carry information, such as sound, by systematically modulating properties of electromagnetic energy waves transmitted through space, such as their amplitude, frequency, phase, or pulse width.
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Radio propagation
Radio propagation is the behavior of radio waves as they travel, or are propagated, from one point to another, or into various parts of the atmosphere.
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Radiolocation
Radiolocating is the process of finding the location of something through the use of radio waves.
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Ramanath Cowsik
Ramanath Cowsik is an Indian astrophysicist and the James S. McDonnell Professor of Space Sciences at the Washington University in St. Louis.
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Rayleigh–Plesset equation
In fluid mechanics, the Rayleigh–Plesset equation or Besant-Rayleigh-Plesset equation is an ordinary differential equation which governs the dynamics of a spherical bubble in an infinite body of incompressible fluid.
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Renormalization
Renormalization is a collection of techniques in quantum field theory, the statistical mechanics of fields, and the theory of self-similar geometric structures, that are used to treat infinities arising in calculated quantities by altering values of quantities to compensate for effects of their self-interactions.
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Richard Helsham
Richard Helsham (1683–1738) was an Irish physician and natural philosopher at Trinity College, Dublin.
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Robert Hooke
Robert Hooke FRS (– 3 March 1703) was an English natural philosopher, architect and polymath.
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RR Lyrae
RR Lyrae is a variable star in the Lyra constellation, located near the border with the neighboring constellation of Cygnus.
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Rutherford scattering
Rutherford scattering is the elastic scattering of charged particles by the Coulomb interaction.
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Satellite television
Satellite television is a service that delivers television programming to viewers by relaying it from a communications satellite orbiting the Earth directly to the viewer's location.
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Scientific Revolution
The Scientific Revolution was a series of events that marked the emergence of modern science during the early modern period, when developments in mathematics, physics, astronomy, biology (including human anatomy) and chemistry transformed the views of society about nature.
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Shell theorem
In classical mechanics, the shell theorem gives gravitational simplifications that can be applied to objects inside or outside a spherically symmetrical body.
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Skyglow
Skyglow (or sky glow) is the diffuse luminance of the night sky, apart from discrete light sources such as the Moon and visible individual stars.
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Solar constant
The solar constant is a flux density measuring mean solar electromagnetic radiation (solar irradiance) per unit area.
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Sonar
Sonar (originally an acronym for SOund Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.
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Soundproofing
Soundproofing is any means of reducing the sound pressure with respect to a specified sound source and receptor.
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Space colonization
Space colonization (also called space settlement, or extraterrestrial colonization) is permanent human habitation off the planet Earth.
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Spacecraft magnetometer
Spacecraft magnetometers are magnetometers used aboard spacecraft and satellites, mostly for scientific investigations, plus attitude sensing.
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Spaghettification
In astrophysics, spaghettification (sometimes referred to as the noodle effect) is the vertical stretching and horizontal compression of objects into long thin shapes (rather like spaghetti) in a very strong non-homogeneous gravitational field; it is caused by extreme tidal forces.
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Specific radiative intensity
Specific (radiative) intensity is a quantity used in physics that describes electromagnetic radiation.
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Square (algebra)
In mathematics, a square is the result of multiplying a number by itself.
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Steam whistle
A steam whistle is a device used to produce sound with the aid of live steam, which acts as a vibrating system (compare to train horn).
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Strong gravity
Strong gravity is a non-mainstream theoretical approach to particle confinement having both a cosmological scale and a particle scale gravity.
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Sun
The Sun is the star at the center of the Solar System.
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Sunlight
Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.
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Surface gravity
The surface gravity, g, of an astronomical or other object is the gravitational acceleration experienced at its surface.
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Tide
Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of Earth.
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Timeline of black hole physics
Timeline of black hole physics.
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Timeline of fundamental physics discoveries
No description.
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Timeline of theoretical physics
The Timeline of theoretical physics lists key events by century.
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Two-body problem in general relativity
The two-body problem (or Kepler problem) in general relativity is the determination of the motion and gravitational field of two bodies as described by the field equations of general relativity.
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Udwadia–Kalaba equation
In theoretical physics, the Udwadia–Kalaba equation Udwadia, F.E.; Kalaba, R.E. (1996).
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Venus
Venus is the second planet from the Sun, orbiting it every 224.7 Earth days.
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Virtual particle
In physics, a virtual particle is a transient fluctuation that exhibits some of the characteristics of an ordinary particle, but whose existence is limited by the uncertainty principle.
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Voyager 2
Voyager 2 is a space probe launched by NASA on August 20, 1977, to study the outer planets.
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Voyager program
The Voyager program is an American scientific program that employs two robotic probes, Voyager 1 and Voyager 2, to study the outer Solar System.
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Wave equation
The wave equation is an important second-order linear partial differential equation for the description of waves—as they occur in classical physics—such as mechanical waves (e.g. water waves, sound waves and seismic waves) or light waves.
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Waveguide
A waveguide is a structure that guides waves, such as electromagnetic waves or sound, with minimal loss of energy by restricting expansion to one dimension or two.
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Whispering-gallery wave
Whispering-gallery waves, or whispering-gallery modes, are a type of wave that can travel around a concave surface.
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Wireless electronic devices and health
The World Health Organization (WHO) has researched electromagnetic fields (EMFs) and their alleged effects on public health, concluding that such exposures within recommended limits do not produce any known adverse health effect.
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Wireless network
A wireless network is a computer network that uses wireless data connections between network nodes.
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54 Piscium
54 Piscium is an orange dwarf star approximately 36 light-years away in the constellation of Pisces.
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Geometric spreading, Inverse Square Law, Inverse Square Laws, Inverse square, Inverse square law, Inverse square law of radiation, Inverse-square, Inverse-square force.
References
[1] https://en.wikipedia.org/wiki/Inverse-square_law
