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A radioactive nuclide can decay simultaneously by two different processes which have decay constants \( \lambda_{1} \) and \( \lambda_{2} \). The effective decay constant of the nuclide is \( \lambda \), then :
\( \mathrm{P} \)
(A) \( \lambda=\lambda_{1}+\lambda_{2} \)
(B) \( \lambda=1 / 2\left(\lambda_{1}+\lambda_{1}\right) \)
(C) \( \frac{1}{\lambda}=\frac{1}{\lambda_{1}}+\frac{1}{\lambda_{2}} \)
(D) \( \lambda=\sqrt{\lambda_{1} \lambda_{2}} \)
W.
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