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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

cesium atom

B

carbon atom

C

hydrogen atom

D

krypton atom

Text Solution

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The correct Answer is:
A
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Knowledge Check

  • Assertion:The atomic size generally increases across a period and decreases down the group. Reason:Atomic size depends upon valence shell electronic configuration.

    A
    a. Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
    B
    b. Both Assertion and Reason are true and Reason is not the correct explanation of Assertion.
    C
    c. Assertion is true but Reason is false.
    D
    d.Both Assertion and Reason are false.

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