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The activity of a sample of radioactive material is \( A_{1} \) at time \( t_{1} \) and \( A_{2} \) at time \( t_{2}\left(t_{2}t_{1}\right) \). If its mean
\( \mathrm{P} \) life is \( T \), then
(a) \( A_{1} t_{1}=A_{2} t_{2} \)
(b) \( A_{1}-A_{2}=t_{2}-t_{1} \)
W
(c) \( A_{2}=A_{1} e^{\left(t_{1}-t_{2}\right) / T} \)
(d) \( A_{2}=A_{1} e^{\left(t_{1} / t_{2}\right) T} \)
(AIIMS)
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