Atomic clock and Clock

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Difference between Atomic clock and Clock

Atomic clock vs. Clock

An atomic clock is a clock device that uses an electron transition frequency in the microwave, optical, or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. A clock is an instrument to measure, keep, and indicate time.

Allan variance

The Allan variance (AVAR), also known as two-sample variance, is a measure of frequency stability in clocks, oscillators and amplifiers, named after David W. Allan and expressed mathematically as \sigma_y^2(\tau).

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Ammonia

Ammonia is a compound of nitrogen and hydrogen with the formula NH3.

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Atom

An atom is the smallest constituent unit of ordinary matter that has the properties of a chemical element.

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Caesium standard

The caesium standard is a primary frequency standard in which electronic transitions between the two hyperfine ground states of caesium-133 atoms are used to control the output frequency.

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Clock drift

Clock drift refers to several related phenomena where a clock does not run at exactly the same rate as a reference clock.

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Coordinated Universal Time

No description.

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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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Energy level

A quantum mechanical system or particle that is bound—that is, confined spatially—can only take on certain discrete values of energy.

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Ephemeris time

The term ephemeris time (often abbreviated ET) can in principle refer to time in connection with any astronomical ephemeris.

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Frequency

Frequency is the number of occurrences of a repeating event per unit of time.

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Global Positioning System

The Global Positioning System (GPS), originally Navstar GPS, is a satellite-based radionavigation system owned by the United States government and operated by the United States Air Force.

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Hertz

The hertz (symbol: Hz) is the derived unit of frequency in the International System of Units (SI) and is defined as one cycle per second.

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Internet

The Internet is the global system of interconnected computer networks that use the Internet protocol suite (TCP/IP) to link devices worldwide.

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Isotopes of caesium

Caesium (55Cs; or cesium) has 40 known isotopes, making it, along with barium and mercury, the element with the most isotopes.

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Louis Essen

Louis Essen FRS O.B.E. (6 September 1908 – 24 August 1997) was an English physicist whose most notable achievements were in the precise measurement of time and the determination of the speed of light.

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Maser

A maser (an acronym for "microwave amplification by stimulated emission of radiation") is a device that produces coherent electromagnetic waves through amplification by stimulated emission.

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Mercury (element)

Mercury is a chemical element with symbol Hg and atomic number 80.

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Microwave

Microwaves are a form of electromagnetic radiation with wavelengths ranging from one meter to one millimeter; with frequencies between and.

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National Institute of Standards and Technology

The National Institute of Standards and Technology (NIST) is one of the oldest physical science laboratories in the United States.

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National Physical Laboratory (United Kingdom)

The National Physical Laboratory (NPL) is the national measurement standards laboratory for the United Kingdom, based at Bushy Park in Teddington, London, England.

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Network Time Protocol

Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems over packet-switched, variable-latency data networks.

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Nuclear magnetic resonance

Nuclear magnetic resonance (NMR) is a physical phenomenon in which nuclei in a magnetic field absorb and re-emit electromagnetic radiation.

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Physical Review Letters

Physical Review Letters (PRL), established in 1958, is a peer-reviewed, scientific journal that is published 52 times per year by the American Physical Society.

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Pulsar clock

A pulsar clock is a clock which depends on counting radio pulses emitted by pulsars.

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Quantum clock

A quantum clock is a type of atomic clock with laser cooled single ions confined together in an electromagnetic ion trap.

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Quartz clock

A quartz clock is a clock that uses an electronic oscillator that is regulated by a quartz crystal to keep time.

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Radio clock

A radio clock or radio-controlled clock (RCC) is a clock that is automatically synchronized by a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.

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Resonance

In physics, resonance is a phenomenon in which a vibrating system or external force drives another system to oscillate with greater amplitude at specific frequencies.

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Satellite navigation

A satellite navigation or satnav system is a system that uses satellites to provide autonomous geo-spatial positioning.

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Second

The second is the SI base unit of time, commonly understood and historically defined as 1/86,400 of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.

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Solar time

Solar time is a calculation of the passage of time based on the position of the Sun in the sky.

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Speaking clock

A speaking clock or talking clock is a live or recorded human voice service, usually accessed by telephone, that gives the correct time.

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Time signal

A time signal is a visible, audible, mechanical, or electronic signal used as a reference to determine the time of day.

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William Thomson, 1st Baron Kelvin

William Thomson, 1st Baron Kelvin, (26 June 1824 – 17 December 1907) was a Scots-Irish mathematical physicist and engineer who was born in Belfast in 1824.

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Ytterbium

Ytterbium is a chemical element with symbol Yb and atomic number 70.

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