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Atomic clock

4:33

How an atomic clock works, and its use in the global positioning system (GPS)

5:30

How Do Atomic Clocks Work?

4:00

NOVA | The Amazing Atomic Clock

2:51

New Atomic Clock Redefines Time

2:11

China's atomic clock: The most accurate clock in the world

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. Atomic clocks are the most accurate time and frequency standards known, and are used as primary standards for international time distribution services, to control the wave frequency of television broadcasts, and in global navigation satellite systems such as GPS.
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