89 relations: Absorbance, Absorptance, Actinometer, Attenuation coefficient, Beer–Lambert law, Beta particle, Beta Pictoris b, Concentrated solar power, Cutback technique, Cygnus CRS Orb-1, Energy rate density, Etendue, Flux, Galileo Probe, Gliese 667, Greek letters used in mathematics, science, and engineering, Habitability of natural satellites, Habitability of red dwarf systems, HCL color space, HD 164922 b, HD 164922 c, Heat flux, History of thermodynamics, HSL and HSV, Index of physics articles (R), Index of radio propagation articles, International System of Units, Irradiance, Ivanpah Solar Power Facility, K2-33b, Kepler-419c, Kepler-442b, Kepler-47b, Kepler-47c, Kepler-61b, Kepler-62b, Kepler-62c, Kepler-62d, Kepler-62e, Kepler-62f, Kepler-76b, Lambert's cosine law, Laser beam profiler, Leaf, Light-emitting diode, List of articles related to the Sun, List of laser applications, List of photonics equations, List of potentially habitable exoplanets, List of stellar properties, ..., Lumen (unit), Luminescent solar concentrator, Luminosity function, Luminous efficacy, Luminous flux, Luminous intensity, Measuring instrument, MESSENGER, NGC 6872, Nonimaging optics, Optical depth, Optothermal stability, Outgoing longwave radiation, Panspermia, Petrozavodsk phenomenon, Photocurrent, Photometer, Photometry (optics), Pioneer Venus Multiprobe, Pioneer Venus project, Radiance, Radiant energy, Radiant exitance, Radiant intensity, Radiometry, Radiosity (radiometry), Reflectance, Responsivity, Satellite, Season, SI derived unit, Solar luminosity, Spectral power distribution, Stefan–Boltzmann law, Sunlight, Transmittance, Wall-plug efficiency, 38 Virginis b, 61 Virginis b. Expand index (39 more) » « Shrink index
In chemistry, absorbance or decadic absorbance is the common logarithm of the ratio of incident to transmitted radiant power through a material, and spectral absorbance or spectral decadic absorbance is the common logarithm of the ratio of incident to transmitted spectral radiant power through a material.
Absorptance of the surface of a material is its effectiveness in absorbing radiant energy.
Actinometers are instruments used to measure the heating power of radiation.
Attenuation coefficient or narrow beam attenuation coefficient of the volume of a material characterizes how easily it can be penetrated by a beam of light, sound, particles, or other energy or matter.
The Beer–Lambert law, also known as Beer's law, the Lambert–Beer law, or the Beer–Lambert–Bouguer law relates the attenuation of light to the properties of the material through which the light is travelling.
A beta particle, also called beta ray or beta radiation, (symbol β) is a high-energy, high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay.
Beta Pictoris b (also abbreviated as β Pic b) is an exoplanet orbiting the young debris disk A-type main sequence star Beta Pictoris located approximately 63 light-years (19.4 parsecs, or nearly km) away from Earth in the constellation of Pictor.
Concentrated solar power (also called concentrating solar power, concentrated solar thermal, and CSP) systems generate solar power by using mirrors or lenses to concentrate a large area of sunlight, or solar thermal energy, onto a small area.
In telecommunications, a cutback technique is a destructive technique for determining certain optical fiber transmission characteristics, such as attenuation and bandwidth.
Cygnus CRS Orb-1, also known as Orbital-1, was the second flight of the Orbital Sciences Cygnus unmanned resupply spacecraft, its second flight to the International Space Station and the third launch of the company's Antares launch vehicle.
Energy rate density is the amount of free energy per unit time per unit mass (in CGS metric units erg/s/g; in MKS units joule/s/kg).
Etendue or étendue is a property of light in an optical system, which characterizes how "spread out" the light is in area and angle.
Flux describes the quantity which passes through a surface or substance.
The Galileo Probe was an atmospheric-entry probe carried by the main ''Galileo'' spacecraft to Jupiter, where it directly entered a hot spot and returned data from the planet.
Gliese 667 (142 G. Scorpii) is a triple-star system in the constellation Scorpius lying at a distance of about 6.8 pc (23.6 ly) from Earth.
Greek letters are used in mathematics, science, engineering, and other areas where mathematical notation is used as symbols for constants, special functions, and also conventionally for variables representing certain quantities.
The habitability of natural satellites is a measure of the potential of natural satellites to have environments hospitable to life.
The habitability of red dwarf systems is determined by a large number of factors from a variety of sources.
HCL (Hue-Chroma-Luminance) is a color space model designed to accord with human perception of color.
HD 164922 b is an exoplanet orbiting the star HD 164922 about 72 light-years from Earth in the constellation Hercules.
HD 164922 c is an exoplanet orbiting the star HD 164922 about 72 light-years from Earth in the constellation Hercules.
Heat flux or thermal flux, sometimes also referred to as heat flux density or heat flow rate intensity is a flow of energy per unit of area per unit of time.
The history of thermodynamics is a fundamental strand in the history of physics, the history of chemistry, and the history of science in general.
HSL (hue, saturation, lightness) and HSV (hue, saturation, value) are two alternative representations of the RGB color model, designed in the 1970s by computer graphics researchers to more closely align with the way human vision perceives color-making attributes.
The index of physics articles is split into multiple pages due to its size.
This is an index to articles about terms used in discussion of radio propagation.
The International System of Units (SI, abbreviated from the French Système international (d'unités)) is the modern form of the metric system, and is the most widely used system of measurement.
In radiometry, irradiance is the radiant flux (power) received by a surface per unit area.
The Ivanpah Solar Electric Generating System is a concentrated solar thermal plant in the Mojave Desert.
K2-33b (also known by its EPIC designation EPIC 205117205.01) is a very young super-Neptune exoplanet, orbiting the pre-main-sequence star K2-33.
Kepler-419c (also known by its Kepler Object of Interest designation KOI-1474.02) is a super-Jupiter exoplanet orbiting within the habitable zone of the star Kepler-419, the outermost of two such planets discovered by NASA's Kepler spacecraft.
Kepler-442b (also known by its Kepler Object of Interest designation KOI-4742.01) is a confirmed near-Earth-sized exoplanet, likely rocky, orbiting within the habitable zone of the K-type main-sequence star Kepler-442, about 1,120 light-years (342 parsecs, or nearly km) from Earth in the constellation Lyra.
Kepler-47b (also known as Kepler-47(AB)-b and by its Kepler Object of Interest designation KOI-3154.01) is an exoplanet orbiting the binary star system Kepler-47, the innermost of three such planets discovered by NASA's ''Kepler'' spacecraft.
Kepler-47c (also known as Kepler-47(AB)-c and by its Kepler Object of Interest designation KOI-3154.02) is an exoplanet orbiting the binary star system Kepler-47, the outermost of three such planets discovered by NASA's ''Kepler'' spacecraft.
Kepler-61b (also known by its Kepler Object of Interest designation KOI-1361.01) is a super-Earth exoplanet orbiting within parts of the habitable zone of the K-type main-sequence star Kepler-61.
Kepler-62b (also known by its Kepler Object of Interest designation KOI-701.02) is the innermost and the second smallest discovered exoplanet orbiting the star Kepler-62, with a diameter roughly 30% larger than Earth.
Kepler-62c (also known by its Kepler Object of Interest designation KOI-701.05) is an approximately Mars-sized exoplanet discovered in orbit around the star Kepler-62, the second innermost of five discovered by NASA's Kepler spacecraft around Kepler-62.
Kepler-62d (also known by its Kepler Object of Interest designation KOI-701.01) is the third innermost and the largest exoplanet discovered orbiting the star Kepler-62, with a size roughly twice the diameter of Earth.
Kepler-62e (also known by its Kepler Object of Interest designation KOI-701.03) is a super-Earth exoplanet (extrasolar planet) discovered orbiting within the habitable zone of Kepler-62, the second outermost of five such planets discovered by NASA's Kepler spacecraft.
Kepler-62f (also known by its Kepler Object of Interest designation KOI-701.04) is a super-Earth exoplanet orbiting within the habitable zone of the star Kepler-62, the outermost of five such planets discovered around the star by NASA's ''Kepler'' spacecraft.
Kepler-76b is a gas giant with the mass about two times of Jupiter.
In optics, Lambert's cosine law says that the radiant intensity or luminous intensity observed from an ideal diffusely reflecting surface or ideal diffuse radiator is directly proportional to the cosine of the angle θ between the direction of the incident light and the surface normal.
A laser beam profiler captures, displays, and records the spatial intensity profile of a laser beam at a particular plane transverse to the beam propagation path.
A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem.
A light-emitting diode (LED) is a two-lead semiconductor light source.
Articles related to the Sun include.
Many scientific, military, medical and commercial laser applications have been developed since the invention of the laser in 1958.
This article summarizes equations in the theory of photonics, including geometric optics, physical optics, radiometry, diffraction, and interferometry.
This is a list of potentially habitable exoplanets and possible exoplanets.
Pages Related to Stellar properties, Pages using the word stellar in a physics context.
The lumen (symbol: lm) is the SI derived unit of luminous flux, a measure of the total quantity of visible light emitted by a source.
A luminescent solar concentrator (LSC) is a device for concentrating radiation, solar radiation in particular, to produce electricity.
A luminosity function or luminous efficiency function describes the average spectral sensitivity of human visual perception of brightness.
Luminous efficacy is a measure of how well a light source produces visible light.
In photometry, luminous flux or luminous power is the measure of the perceived power of light.
In photometry, luminous intensity is a measure of the wavelength-weighted power emitted by a light source in a particular direction per unit solid angle, based on the luminosity function, a standardized model of the sensitivity of the human eye.
A measuring instrument is a device for measuring a physical quantity.
Messenger (stylized as MESSENGER, whose backronym is "MErcury Surface, Space ENvironment, GEochemistry, and Ranging", and which is a reference to the messenger of the same name from Roman mythology) was a NASA robotic spacecraft that orbited the planet Mercury between 2011 and 2015.
NGC 6872, also known as the Condor Galaxy, is a large barred spiral galaxy of type in the constellation Pavo.
Nonimaging optics (also called anidolic optics)Roland Winston et al., Nonimaging Optics, Academic Press, 2004 R. John Koshel (Editor), Illumination Engineering: Design with Nonimaging Optics, Wiley, 2013 is the branch of optics concerned with the optimal transfer of light radiation between a source and a target.
In physics, optical depth or optical thickness, is the natural logarithm of the ratio of incident to transmitted radiant power through a material, and spectral optical depth or spectral optical thickness is the natural logarithm of the ratio of incident to transmitted spectral radiant power through a material.
Optothermal stability describes the rate at which an optical element distorts due to a changing thermal environment.
Outgoing Longwave Radiation (OLR) is the energy radiating from the Earth as infrared radiation at low energy to Space.
Panspermia is the hypothesis that life exists throughout the Universe, distributed by space dust, meteoroids, asteroids, comets, planetoids, and also by spacecraft carrying unintended contamination by microorganisms.
The Petrozavodsk phenomenon was a series of celestial events of a disputed nature that occurred on September 20, 1977.
Photocurrent is the electric current through a photosensitive device, such as a photodiode, as the result of exposure to radiant power.
A photometer, generally, is an instrument that measures light intensity or the optical properties of solutions or surfaces.
Photometry is the science of the measurement of light, in terms of its perceived brightness to the human eye.
The Pioneer Venus Multiprobe, also known as Pioneer Venus 2 or Pioneer 13 was a spacecraft launched in 1978 to explore Venus as part of NASA's Pioneer program.
The Pioneer Venus project was part of the Pioneer program consisting of two spacecraft, the Pioneer Venus Orbiter and the Pioneer Venus Multiprobe, launched to Venus in 1978.
In radiometry, radiance is the radiant flux emitted, reflected, transmitted or received by a given surface, per unit solid angle per unit projected area.
In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation.
In radiometry, radiant exitance or radiant emittance is the radiant flux emitted by a surface per unit area, whereas spectral exitance or spectral emittance is the radiant exitance of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
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.
Radiometry is a set of techniques for measuring electromagnetic radiation, including visible light.
In radiometry, radiosity is the radiant flux leaving (emitted, reflected and transmitted by) a surface per unit area, and spectral radiosity is the radiosity of a surface per unit frequency or wavelength, depending on whether the spectrum is taken as a function of frequency or of wavelength.
Reflectance of the surface of a material is its effectiveness in reflecting radiant energy.
Responsivity measures the input–output gain of a detector system.
In the context of spaceflight, a satellite is an artificial object which has been intentionally placed into orbit.
A season is a division of the year marked by changes in weather, ecology, and amount of daylight.
SI derived units are units of measurement derived from the seven base units specified by the International System of Units (SI).
The solar luminosity,, is a unit of radiant flux (power emitted in the form of photons) conventionally used by astronomers to measure the luminosity of stars, galaxies and other celestial objects in terms of the output of the Sun.
In radiometry, photometry and color science, a spectral power distribution (SPD) measurement describes the power per unit area per unit wavelength of an illumination (radiant exitance).
The Stefan–Boltzmann law describes the power radiated from a black body in terms of its temperature.
Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light.
Transmittance of the surface of a material is its effectiveness in transmitting radiant energy.
In optics, wall-plug efficiency or radiant efficiency is the energy conversion efficiency with which the system converts electrical power into optical power.
38 Virginis b is a super-Jupiter exoplanet orbiting within the habitable zone of the star 38 Virginis about 107 light-years (32.7 parsecs, or nearly km) from Earth in the constellation Virgo.
61 Virginis b (abbreviated 61 Vir b) is an extrasolar planet, orbiting the 5th magnitude G-type star 61 Virginis, in Virgo.