A radioactive nucleus can decay by two different processes. The mean value period for the First ...

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A radioactive nucleus can decay by two different processes. The mean value period for the First process is \( t_{1} \) and that for the second process is \( t_{2} \). The effective mean value period for the two processes is:
(A) \( \frac{t_{1}+t_{2}}{2} \)
(B) \( t_{1}+t_{2} \)
(C) \( \sqrt{t_{1} t_{2}} \)
(D) \( \frac{t_{1} t_{2}}{t_{1}+t_{2}} \)
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