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Two radioactive substances \( A \) and \( B \) have decay
\( \mathrm{P} \) constants \( 5 \lambda \) and \( \lambda \) respectively. At \( t=0 \), they have the same number of nuclei. The ratio of number of
W nuclei of \( A \) to those of \( B \) will be \( (1 / e)^{2} \) after a time interval
(a) \( 4 \lambda \)
(b) \( 2 \lambda \)
(c) \( 1 / 2 \lambda \)
(d) \( 1 / 4 \lambda \)
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