If H-atom is supplied with 12.1 eV energy and electron returns to the ground state after excitation, the number of spectral lines in Balmer series would be: (use energyof ground state of H-atom = -13.6 eV)

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Detailed Solution

New energy =−13.6+12.1=−1.5eVEn=−13.6n2⇒n2=−13.6−1.5=9⇒n=3Number of spectral lines in Balmer series for 3 → 2 transition would be one only.

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