Physics, asked by Sazet, 6 hours ago

The si standard of time is based on ____?

(a) the daily rotation of earth

(b) the frequency of light emitted by Kr86

(c) a precision pendulum clock

(d) the yearly revution of earth about the sun

Answers

Answered by avsharma17222

2

Answer:

I think the a one is correct..

Answered by diyapardhi2006

0

Explanation:

E. none of these
hope it helps

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