Three fourth of the active decays in a radioactive sample in \( 3 / 4 \mathrm{sec} \). The half-...

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Three fourth of the active decays in a radioactive sample in \( 3 / 4 \mathrm{sec} \). The half-life of the sample is
(A) \( \frac{1}{2} \sec \)
(B) \( 1 \mathrm{sec} \)
(C) \( \frac{3}{8} \sec \)
(D) \( \frac{3}{4} \sec \)
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