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Two radioactive substances A and B have decay constants 5 λ and λ respectively. At t = 0 they have the same number of nuclei.

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

(a) 4λ

(b) 2λ

(c) 1/2λ

(d) 1/4λ

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The correct option is (c) 1/2λ.

Explanation:

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