7/8th of the active nuclei present in a ...

`7/8th` of the active nuclei present in a radioactive sample has decayed in `8 s`. The half-life of the sample is

A

2s

B

1s

C

7s

D

`(8)/(3)` s

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The correct Answer is:

D

3 half lives have passed in 8 seconds, `t_(1//2) =(8)/(3) s`

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