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

Options

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`

Answer

D