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Two radioactive substance A and B have decay constants `5lamdaand lamda,` 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 `((1)/(e))^(2)` efter a time interval.

A

`1/(2lambda)`

B

`1/(4lambda)`

C

`4lambda`

D

`2lambda`

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A
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