If the activity of radioactive sample drops to \( 1 / 32 \) of its initial value in \( 7.5 \math...

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If the activity of radioactive sample drops to \( 1 / 32 \) of its initial value in \( 7.5 \mathrm{hr} \). Half life will be-
(a) \( 3 \mathrm{hr} \)
(b) \( 4.5 \mathrm{hr} \)
(c) \( 7.5 \mathrm{hr} \)
(d) \( 1.5 \mathrm{hr} \).
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