Q 1703780648.     Two radioactive substances A and B have decay constants `5\lambda` and `\lambda` respectively. At t=0, they have the same number of nuclei. The ratio of number of nuclei of A to those of B will be `(1/e^{2})` after a time:

AIIMS 2010
A

`4\lambda`

B

`2\lambda`

C

`frac{1}{2\lambda}`

D

`frac{1}{4\lambda}`

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