The mass of proton is $1.0073 u$ and that of neutron is $1.0087 u(u=$ atomic mass unit). The binding energy…
The mass of proton is $1.0073 u$ and that of neutron is $1.0087 u(u=$ atomic mass unit). The binding energy of ${ }_2^4 \mathrm{He}$ is:
(Given helium nucleus mass $\approx 4.0015$ u)
$0.0305 \mathrm{~J}$
$0.0305 \mathrm{erg}$
$28.4 \mathrm{Me} \mathrm{V}$
$0.061 \mathrm{u}$
Solution
$\mathrm{BE}=4 m \times 931$ $=[2(1.0087+1.0073)-4.0015] \times$ 931 $=28.4 \mathrm{MeV}$.