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Units, Dimensions and Measurement — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsUnits, Dimensions and Measurement1 Mark
MCQ
One second is equal to
  • A
    1650763.73 time periods of $K r$ clock
  • B
    652189.63 time periods of $K r$ clock
  • C
    1650763.73 time periods of $C s$ clock
  • ✓
    9192631770 time periods of Cs clock
✓

Answer

Correct option: D.
9192631770 time periods of Cs clock
(d) lt is by standard definition.

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