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Two radioactive materials X(1) and X(2) ...

Two radioactive materials `X_(1)` and `X_(2)` have decay constants `5 lambda` and `lambda` respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of `X_(1)` to that of `X_(2)` will be `1/e` after a time
(1.) λ
(2.) 1/ 2 λ
(3.) 1/ 4 λ
(4.) e/ λ

A

`e/lambda`

B

`lambda`

C

`1/2 lambda`

D

`1/(4lambda)`

Text Solution

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The correct Answer is:
D
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