Suppose a ${ }_{88}^{226}\mathrm{Ra}$ nucleus at rest and in ground state undergoes  $\mathrm{\alpha }-\mathrm{decay}\mathrm{to}\mathrm{a} {}_{86}^{222}\mathrm{Rn}$ nucleus. Find the kinetic energy of the emitted  particle (in MeV).  [Given: atomic mass of ${ }_{88}^{226}\mathrm{Ra}=226.005\mathrm{u}$, atomic mass of ${ }_{86}^{222}\mathrm{Rn}=222.000\mathrm{u}$, atomic mass of $\mathrm{\alpha }$ particle=4.000u, $1\mathrm{u}=931\mathrm{MeV}/{\mathrm{c}}^2$, c is speed of the light, Take $\frac{222}{226}=0.98$]