Excitation energy of a hydrogen like ion, in its first excitation state, is 40.8 eV. The energy needed to remove the electron from the ion in ground state is

Options

(a) 13.6 eV
(b) 27.2 eV
(c) 40.8 eV
(d) 54.4 eV

Correct Answer:

54.4 eV

Explanation:

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