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JEE Main 2023 (12 Apr, Shift 1) · Transitions, Photon Emission & Excitation

Transitions, Photon Emission & Excitation question from JEE Main 2023 (12 Apr, Shift 1)

Q37JEE Main 2023 · 12 APR · SHIFT 1Medium

Transitions, Photon Emission & Excitation

A $12.5\text{ eV}$ electron beam is used to bombard gaseous hydrogen at room temperature. The number of spectral lines emitted will be:

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Answer: (c)

An electron can give any part of its 12.5 eV. Excitation energies: $n=3$ needs 12.09 eV, $n=4$ needs 12.75 eV.
So the highest level reached is $n = 3$ .
Lines $= \frac{3 \times 2}{2} = 3$
So the answer is (c) 3.

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