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  4. The ground state energy of hydrogen atom is 13.6 e V. The energy needed To ionise hydrogen atom from its second excited state is

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Q. The ground state energy of hydrogen atom is $13.6\, e V$. The energy needed To ionise hydrogen atom from its second excited state is

KCETKCET 2022

Solution:

For second excited state $n=3,$
$ E_{3}=13.6 / 3^{2}=13.6 / 9=1.51\, eV$