Two radioactive materials X₁ and X₂ have decay constants 5λ and λ respectively. If initially they have the same number of nuclei, then the ratio of number of nuclei of X₁ to that of X₂ will be 1/e after a time

Options

(a) λ
(b) 1/2 λ
(c) 1/4 λ
(d) e/λ

Correct Answer:

1/4 λ

Explanation:

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