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The radioactive materials X1 and X2 have...

The radioactive materials `X_1` and `X_2` have decay constants `5lambda` and `lambda` respectively. If intially they have the same number of nuclei, then the ratio of number of nuclei of `X_1` to that of `X_2` will be `1/e`

A

`lambda `

B

`1/2lambda`

C

`1/(4lambda)`

D

`e/lambda`

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