The energy of a hydrogen atom in the ground state is –13.6 eV. The energy of a He + ion in the first excited state will be
Text Solution
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A
Energy of an hydrogen like atom like 
in an 
orbit is given by
For hydrogen atom, 
For ground state, 
For 
ion, 
For first excited state, 
Hence, the energy in 
ion in first excited state is same that of energy of the hydrogen atom in ground state i.e. -13.6 eV
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