Two radioactive substances A and B have decay constants 5λ and λ respectively. At t=0, they have the same number of nuclei. The ratio of number of nuclei of A to that of B will be (1/e)2 after a time interval of

1λ

12λ

13λ

14λ

A

14λ

B

1λ

C

12λ

D

13λ

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Solution

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We know that: N=N0e−λt For A: NA=N0e−5λt For B: NB=N0e−λt

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