A radioactive substance is being produced at a constant rate of 200...

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A radioactive substance is being produced at a constant rate of 200 nuclei/s. The decay constant of the substance is
\( \mathrm{P} \) \( 1 \mathrm{~s}^{-1} \). After what time the number of radioactive nuclei will

W become 100 . Initially there are no nuclei present :
(A) \( 1 \mathrm{sec} \)
(B) \( \frac{1}{\ln (2)} \sec \)
(C) \( \ln (2) \sec \)
(D) \( 2 \mathrm{sec} \)
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