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Activity of a radioactive substance is \( R_{1} \) at time \( t_{1} \) and \( R_{2} \) at time \( t_{2}\left(t_{2}t_{1}\right) \). Then the ratio \( \frac{R_{2}}{R_{1}} \) is:
\( P \)
(A) \( \frac{t_{2}}{t_{1}} \)
(B) \( \mathrm{e}^{-\lambda\left(\mathrm{t}_{1}+\mathrm{t}_{2}\right)} \)
(C) \( e\left(\frac{t_{1}-t_{2}}{\lambda}\right) \)
(D) \( \mathrm{e}^{\lambda\left(t_{1}-t_{2}\right)} \)
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