Two radioactive materials X1X1 contain same number of nuclei. If 6λs−1 and 4λs−1 are the decay constants of X1 and X2 respectively, the ratio of number of 48 nuclei, undecayed of X1 to that of X2 will be (1/e) after a time.

12λsec

110λsec

15λ

18λsec

A

18λsec

B

12λsec

C

15λ

D

110λsec

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