Hint: The binding energy depends on the charge and the mass of the nucleons.
Step 1: Find the binding energy of the H-atom.
The binding energy in H-atom,
E=me44ε20h2=13.6 eV ........(i)E=me44ε20h2=13.6 eV ........(i)
If proton and neutron had charge e' each and were governed by the same electrostatic force, then in the above equation, we would need to replace electronic mass m with the reduced mass m' of proton-neutron and the electronic charge e by e'.
m'=M×NM+N=M2m'=M×NM+N=M2
=1836 m2=918 m=1836 m2=918 m
Here, M represents the mass of a neutron/proton.
Step 2: Find the binding energy of Deuteron.
∴ Binding energy=918m(e')48ε20h2=2.2 MeV .......(ii)∴ Binding energy=918m(e')48ε20h2=2.2 MeV .......(ii)
Step 3: Find the ratio (e'/e).
Dividing Eqs. (ii) and (i), we get,
918(e'e)4=2.2 MeV13.6 eV=2.2×10613.6918(e'e)4=2.2 MeV13.6 eV=2.2×10613.6
(e'e)4=2.2×10613.6×918(e'e)4=2.2×10613.6×918
e'e=(176.21)14=3.64e'e=(176.21)1/4=3.64