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Two radioactive materials `X_(1)` and `X_(2)` have decay constant `11 lambda` and `lambda` respectively. If initially they have same number of nuclei, then ratio of number of nuclei of `X_(1)` to `X_(2)` will be `(1)/(e^(2))` after a time

A

`(1)/(10 lambda)`

B

`(1)/(11 lambda)`

C

`(11)/(10 lambda)`

D

`(1)/(9 lambda)`

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The correct Answer is:
D
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