for the force
between an electron and a proton. The 
dependence
of I F I 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 nip, force
would be modified to 
Estimate the
change in the ground state energy of a H-atom if mp-were 10-6
times the mass of an electron.
Answer:
Here, we suppose mass of
photon, 
electronic mass
Which is much larger than
Bohr radius.
As 
? (i)
?(ii)
therefore from (i) 
?(iii)
From (iii),
Neglecting 
, we get 
From
(ii) ,
i.e., V(r) remains unchanged.
Total
energy 
Change in ground state energy of hydrogen atom, 
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