1.

A radioactive sample with half-life=T emits `alpha`-particles. Its total activity is `A_(i)` at some time and `(A_(f))` at a later time. The number of `alpha`-particle emitted by the sample between these two points in time isA. `A_(i)-A_(f)`B. `(T)/(In2)(A_(i)-A_(f))`C. `(In 2)/(T)(A_(i)-A_(f))`D. `(T)/(In 2)((1)/(A_(f))-(1)/(A_(i)))`

Answer» Correct Answer - B


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