The groud state energy of hydrogen atom is `-13.6 eV`. When its electron is in first excited state, its exciation energy is
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Energy in ground state `E_1=-13.6eV`. Energy is first excited state, `E_2=(-13.6)/(2^2)=-3.4eV.` `:.` Required energy =`E_2-E_1` `=-3.4-(-13.6)=10.2eV`
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