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The activity of a sample of radioactive material is \( A_{1} \) at time \( t_{1} \) and \( A_{2} \) at time \( t_{2}\left(t_{2}t_{1}\right) \). Its mean life is \( T \).
(A) \( \mathrm{A}_{1} \mathrm{t}_{1}=\mathrm{A}_{2} \mathrm{t}_{2} \)
(B) \( \frac{A_{1}-A_{2}}{t_{2}-t_{1}}= \) constant
\( P \)
(C) \( \mathrm{A}_{2}=\mathrm{A}_{1} \mathrm{e}^{\left(\mathrm{t}_{1}-\mathrm{t}_{2}\right) / \mathrm{T}} \)
(D) \( \mathrm{A}_{2}=\mathrm{A}_{1} \mathrm{e}^{\left(\mathrm{t}_{1} / \mathrm{T} \mathrm{t}_{2}\right)} \)
W
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