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The energy of the electron in the ground...

The energy of the electron in the ground state of H-atom is `-13.6 eV`. The energy of the first excited state will be

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Energy of an electron in `n^(th)` level of H-atom is
`E_n = -(13.6)/(n^2) eV`
The energy in first excited state `(n = 2), E_2 = - (13.6)/(2^2) eV = -3.4 eV`.
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