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

    Options :-

    1. 20 years and 5 years, respectively
    2. 20 years and 10 years, respectively
    3. 10 years each
    4. 5 years each
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