Excitation energy of a hydrogen like ion in its first excitation state – McqOptions

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1.	Excitation energy of a hydrogen like ion in its first excitation state is 40.8 eV. Energy needed to remove the electron from the ion in ground state is [KCET 2004]
A.	54.4 eV
B.	13.6 eV
C.	40.8 eV
D.	27.2 eV
Answer» B. 13.6 eV

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