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N atoms of a radioactive element emit n ...

`N` atoms of a radioactive element emit `n` alpha particles per second. The half-life of tge element is.

A

`n/N` sec

B

1.44 `n/N` sec

C

0.69 `n/N` sec

D

0.69 `N/n` sec

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The correct Answer is:
D
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