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Question

If the ionisation energy for H atom is 13.6 eV, then calculate the energy in eV when the atom is excited from the ground state to the first excited state?

A
3.6 eV
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B
10.2 eV
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C
13.75 eV
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D
13.6 eV
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Solution

The correct option is B 10.2 eV
Energy required to excite electron from ground state (n=1) to first excited state (n=2) will be given by,
ΔE= E2 E1 where En = 13.6×Z2n2
Hence,
E2 = 13.6×1222
E1 = 13.6×1212
Therefore,
ΔE= E2 E1 = (13.6×14) (13.6×11)
=13.63.4 = 10.2 eV



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