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

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

A

`(R_(1)T_(1)-R_(2)T_(2))`

B

`(R_(1)-R_(2))`

C

`(R_(1)-R_(2))//T`

D

`(R_(1)-R_(2))T`

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