If the ionisation energy for H atom is 13.6eV, then calculate the energy in eV when the atom is excited from the ground state to the first excited state?
A
3.6eV
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B
10.2eV
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C
13.75eV
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D
13.6eV
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Solution
The correct option is B10.2eV Energy required to excite electron from ground state (n=1) to first excited state (n=2) will be given by, ΔE=E2−E1whereEn=−13.6×Z2n2
Hence, E2=−13.6×1222 E1=−13.6×1212
Therefore, ΔE=E2−E1=(−13.6×14)−(−13.6×11) =13.6−3.4 = 10.2eV