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Question

1ns is defined as


A

10-9s of Kr–clock of 1650763.73 oscillations

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B

10-9s of Kr–clock of6521389.63 oscillations

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C

10-9s of Cs–clock of 1650763.73oscillations

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D

10-9s of Cs–clock of 9192631770 oscillations

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Solution

The correct option is D

10-9s of Cs–clock of 9192631770 oscillations


Step 1: Definition of 1s

One second is the amount of time in which the radiation corresponding to the transition between the two hyperfine levels of the ground state of cesium-133 atom completes its 9192631770 periods.

Step 2: Write relation between second and nanosecond

1ns=1×10-9s

Step 3: Definition of 1 ns

Now, we can say, one nanosecond is 10-9s of Cs-clock of 9192631770oscillations.

Hence, option (D) is correct.


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