If the binding energy of the electron in a hydrogen atom is 13.6eV, the energy required to remove the electron from the first excited state of Li2+ is:
A
30.6eV
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B
13.6eV
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C
3.4eV
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D
122.4eV
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Solution
The correct option is A30.6eV E of Li++ at n=2=(13.6)3222=30.6eV