A radioactive substance is being produced at a constant rate of 10 ...

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A radioactive substance is being produced at a constant rate of 10 nuclei/s. The decay constant of the substance is \( 1 / 2 \mathrm{sec}^{-1} \). After what time the number of radioactive nuclei will become 10 ? Initially there
\( \mathrm{P} \) are no nuclei present. Assume decay law holds for the sample.

W
(A) \( 2.45 \mathrm{sec} \)
(B) \( \log (2) \sec \)
(C) \( 1.386 \mathrm{sec} \)
(D) \( \frac{1}{\ln (2)} \sec \)
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