A light of energy 12,75 eV is incident on a hydrogen atom in its ground state. The atom absorbs the radiation and reaches to one of its excited states. The angular momentum of the atom in the excited state is 
x 10 -17 eVs. The value of x is_________(use h = 4.14 x 10 -15 eVs, c = 3 x 10 8 ms -1 ).
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(828)
In the ground state energy = -13.6 eV
So energy
n = 4
Angular momentum = 
Angular momentum = 
x 4.14 x 10 -15
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