Question

What is an atomic clock? where it is kept
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Answer 1

Answer:

An atomic clock is a clock device (time standard) that uses a hyperfine transition frequency in the microwave, or electron transition .

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Answer 2

Answer:

An atomic clock is a clock device that uses a hyperfine transition frequency in the microwave, or electron transition frequency in the optical or ultraviolet region of the electromagnetic spectrum of atoms as a frequency standard for its timekeeping element. 

In India it is kept in National Physical Laboratory of India New Delhi.

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