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Two radioactive materials X1 and X2 have...

Two radioactive materials `X_1` and `X_2` have decay constants `10 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 :

A

`1/(10lambda)`

B

`1/(11lambda)`

C

`1/(10lambda)`

D

`1/(9lambda)`.

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