Question

A $12.5eV$ electron beam is used to bombard gaseous hydrogen at room temperature. It will emit:

• A. 2 lines in the Lyman series and 1 line in the Balmer series
• B. 3 lines in the Lyman series
• C. 1 lines in the Lyman series and 2 line in the Balmer series
• D. 3 lines in the Balmer series

Answer 1

The correct option is A 2 lines in the Lyman series and 1 line in the Balmer series

Find energy level would be $n=3$
So due to de-excitation, 2 Lyman series and 1 Balmer series wavelength would emit.