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Two radiactive material A(1) and A(2) ha...

Two radiactive material `A_(1)` and `A_(2)` have decay constants of `10 lambda_(0)` and `lambda_(0)`. If initially they have same number of nyclei, the ratio of number of their undecayed nuclei will be `(1//e)` after a time

A

`1/(lambda_0)`

B

`1/(9lambda_0)`

C

`1/(10 lambda_0)`

D

1

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The correct Answer is:
B
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