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  4. A radioactive sample decays (7/4) times its original quantity in 15 minutes. The half-life of the sample is

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Q. A radioactive sample decays $\frac{7}{4}$ times its original quantity in 15 minutes. The half-life of the sample is

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Solution:

Remaining $=\frac{1}{8} $
$3 t _{1 / 2}=15 \min $
$ t _{1 / / 2}=5 \min $