A radioactive sample S1 having an activity of 5uCi has twice the number of nuclei as another sample S2 which has an activity of

Question

A radioactive sample S1 having an activity of 5uCi has twice the number of nuclei as another sample S2 which has an activity of 10uCi The half lives of S1 and S2 can be 1 20 years and 5 years respectively 2 20 years and 10 years respectively 3 10 years each 4 5 years each The half life period of a radioactive substance

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