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Radioactive material A has decay constan...

Radioactive material `A` has decay constant `8 lamda` and material `B` has decay constant `lamda`. Initial they have same number of nuclei. After what time, the ratio of number of nuclei of material `B` to that `A` will be `(1)/( e)` ?

A

`(1)/(lambda)`

B

`(1)/(7lambda)`

C

`(1)/(8lambda)`

D

`(1)/(9lambda)`

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The correct Answer is:
B
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