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Two radioactive materials X(1) and X(2) ...

Two radioactive materials `X_(1)` and `X_(2)` have decay constants `5 lambda` and `lambda` respectively. If initially they have the same number of nuclei, then the ratio of the number of muclei of `X_(1)` to that of `X_(2)` will be `1/e` after a time

A

`1/(2lambda)`

B

`1/(4lambda)`

C

`1/(6lambda)`

D

`1/(8lambda)`

Text Solution

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The correct Answer is:
B
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TARGET PUBLICATION-ATOMS, MOLECULES AND NUCLEI -Evaluation test
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