NCERT Physics Class 12 Exemplar Ch 12 Atoms Part 5

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28 The inverse square law in electrostatics is

for the force between an electron and a proton. The dependence of can be understood in quantum theory as being due to the fact that the ‘particle’ of light (photon) is mass less. If photons had a mass , force would be modified to

Estimate the change in the ground state energy of a H-atom if mp were times the mass of an electron.

Ans:

Boheradius.

Where

Also

If

Since

Or

remains unchanged.

Total energy =

Change in energy

Developed by: