The SI standard of time is based on_____________?
Correct answer: E. none of these
- A. the daily rotation of the earth
- B. the frequency of light emitted by Kr86
- C. the yearly revolution of the earth about the sun
- D. a precision pendulum clock
- E. none of these
Explanation
The SI second is defined using the frequency of radiation from the caesium-133 atom, specifically 9,192,631,770 cycles. Since no option mentions caesium-133, none of the listed statements is correct.
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