NEET Physics Nuclei Questions Solved


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

(a) Excitation energy

E=E2-E1=13.6 Z2112-122

40.8=13.6×34×Z2Z=2

Now required energy to remove the electron from ground state

=+13.6 Z212=13.6 Z2=54.4 eV

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