Question

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What is the si unit of time ?
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Answer 1

Answer:

seconds (s)

Explanation:

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Answer 2

Answer:

it defined by taking the fixed numirical valueof the cesium frequency cs the unprembted ground state hyperfine transition frequency of cesium 133 atom ,to be 91 9 2 6 3 1 7 7 0 when expresed in unit hz.