The half-life of a radioactive sample is...

The half-life of a radioactive sample is `T`. If the activities of the sample at time `t_(1)` and `t_(2)` `(t_(1) lt t_(2))` and `R_(1)` and `R_(2)` respectively, then the number of atoms disintergrated in time `t_(2)-t_(1)` is proportional to

`(R_1-R_2)T`

`(R_1+R_2)T`

`(R_1R_2)/(R_1+R_2)T`

`(R_1+R_2)/T`

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