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A radioactive sample S₁ having an activity of 5 μCi has twice the number of nuclei

A radioactive sample S₁ having an activity of 5 μCi has twice the number of nuclei as another sample S₂ which has an activity of 10 μCi. The half lives of S₁ and S₂ can be

Options

(a) 20 years and 5 years, respectively
(b) 20 years and 10 years respectively
(c) 10 years each
(d) 5 years each

Correct Answer:

20 years and 5 years, respectively

Explanation:

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