A radioactive sample S(1) having the act...

A radioactive sample `S_(1)` having the activity `A_(1)` has twice the number of nucleic as another sample `S_(2)` of activity `A_(2)`. If `A_(2)=2A_(1)`, then the ratio of half-life of `S_(1)` to the half-life of `S_(2)` is

0.25

0.75

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