Answer :

corresponds to Balmer series transition from n=5 to n=2. Now the electron of ground state requires energy for moving to 5th orbit from 1st orbit.

Energy at n=1,



Energy at n=5,



energy required =




Now if the momentum is conserved, we know that, angular momentum for electron in nth orbit is given as,



Initial momentum = final momentum


Momentum of electron in 5th orbit


= Momentum of electron in 2nd orbit+ momentum of photon




the momentum of the photon released =


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