Two radioactive materials \( X_{1} \) and \( X_{2} \) have decay constants \( 10 \lambda \) and ...

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Two radioactive materials \( X_{1} \) and \( X_{2} \) have decay constants \( 10 \lambda \) and \( \lambda \) respectively. If initially they have the same number of
\( \mathrm{P} \) nuclei, then the ratio of the number of nuclei of \( X_{1} \) to that of \( X_{2} \)

W will be \( 1 / e \) after a time :
(B) \( \frac{1}{11 \lambda} \)
(A) \( \frac{1}{10 \lambda} \)
(D) \( \frac{1}{9 \lambda} \)
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