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Two raidoactive substances A and B Have ...

Two raidoactive substances A and B Have decay constants `5lambda` and `lambda` respectively. At `t=0` they have the same number of nuclei.The ratio of number of nuclei of A to those of B will be after `(1/e)^2` a time interval:

A

`1/(2lambda)`

B

`1/(4lambda)`

C

`4lambda`

D

`2lambda`

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