Solution

Calculate the $Q$-value for the reaction taking place in Rutherford's experiment on artificial disintegration of nitrogen by bombardment with alpha particles. Relative masses are: ${}^{15}_{7}\mathrm{N} = 14.007515\,\mathrm{u}$, ${}^{4}_{2}\mathrm{He} = 4.003837\,\mathrm{u}$, ${}^{17}_{8}\mathrm{O} = 17.004533\,\mathrm{u}$ and ${}^{1}_{1}\mathrm{H} = 1.008142\,\mathrm{u}$.