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Two radioactive substances A and B have ...

Two radioactive substances A and B have decay constants `5lamda` and `lamda` respectively. At t-0, they have the same number of nuclei. The ratio of number of nuclei of A to that of B will be `(1//e)^(2)` after a time interval of

A

`(1)/(lamda)`

B

`(1)/(2lamda)`

C

`(1)/(3lamda)`

D

`(1)/(4lamda)`

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