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Two radioactive materials X1 and X2 cont...

Two radioactive materials `X_1` and `X_2` contain same number of nuclei. If `6lambdas^(-1)` and `4lambdas^(-1)` are the decay constants of `X_1` and `X_2` respectively, the ratio of number of nuclei undecayed of `X_1` to that of `X_2` will be 1/e after a time

A

`1/(10lambda)`

B

`1/(11lambda)`

C

`11/(10lambda)`

D

`1/(9lambda)`

Text Solution

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The correct Answer is:
D
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