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Atomic clock generally used in the natio...

Atomic clock generally used in the national standards, is based on the periodic vibrations produced in a 

A

`pm 1 x 10^(-13) s`

B

`pm 1 x 10^(13) s`

C

`pm 1 x 10^(-31) s`

D

`pm 1 x 10^(-33) s`

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The correct Answer is:
A
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