The ratio activity of an element becomes \( 1 / 64 \) th of its original value in \( 60 \mathrm{...
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The ratio activity of an element becomes \( 1 / 64 \) th of its original value in \( 60 \mathrm{sec} \). Then the half-life period is
(A) \( 5 \mathrm{sec} \)
(B) \( 10 \mathrm{sec} \)
(C) \( 20 \mathrm{sec} \)
(D) 30 sec
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