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The radioactivity of a sample is R(1) at...

The radioactivity of a sample is `R_(1)` at time `T_(1)` and `R_(2)` at time `T_(2)`. If the half life of the specimen is T then number of atoms that have disintegrated in time `(T_(2) - T_(1))` is proportional to

A

`I_1 t_2 - I_2 t_1`

B

`I_1 - I_2`

C

`(I_1 - I_2)/(tau_(1//2))`

D

`(I_1 - I_2) tau_(1//2)`

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