(a)[2]
State the meaning of the mass defect of a nucleus.
(b(i))[2]
Some masses are given in Table 12.1. Show that $1.00\,\text{u}$ has an energy equivalent of $934\,\text{MeV}$.
(b(ii))[2]
Show that the binding energy per nucleon for a helium-4 nucleus is $7.09\,\text{MeV}$.
(c)[2]
Hydrogen isotopes have binding energy per nucleon values below $3\,\text{MeV}$. Suggest why a helium-4 nucleus does not break down spontaneously to form hydrogen nuclei.