How many beta-particles are emitted during one hour by `1.0mu g of Na^(24)` radionuclide whose half-life is `15` hours?

Explanation

Here `N_(0)=(1mug)/(24 g)xx6.023xx10^(23)= 2.51xx10^(16)`
Also `lambda=(In2)/(T_(1//2))= 0.04621` per hour
So the number of `beta` rays emitted in one hour is
`N_(0)(1-e^(-lambda))= 1.13xx10^(15)`