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Radioactive material 'A' has decay const...

Radioactive material 'A' has decay constant `8lambda` and material 'B' has decay constant 'lambda' . Intially they have same number of nuclei . After what time the ratio of number 'B' to that 'A' will be`1/e`.

A

`1/(7lambda)`

B

`1/(8lambda)`

C

`1/(9lambda)`

D

none of these

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