A radioactive sample S1 having an activi...

A radioactive sample `S_1` having an activity of `5muCi` has twice the number of nuclei as another sample `S_2` which has an activity of `10muCi`. The half-lives of `S_1` and `S_2` can be

20 yr and 5 yr, respectively

20 yr and 10 yr , respectively

10 yr each

5 yr . each

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