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For the first order reaction with rate constant \( k \), which expression gives the half-life period?
\( \mathrm{P} \) (Initial concentration \( =a \) )

W)
(1) \( \frac{1^{2}}{k} \)
(2) \( \frac{1}{\mathrm{ka}} \)
(3) \( \frac{0.693}{k} \)
(4) \( \frac{3}{2 k a^{2}} \)
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