MDCAT Physics MCQ #327

Why do spectral lines become less distinct as gas pressure increases?

MDCAT Physics MCQ #327

  1. Question 1

    Q1. Why do spectral lines become less distinct as gas pressure increases?

    • A) Frequent collisions perturb electron energy levels.
    • B) Gas pressure increases photon scattering.
    • C) Temperature rises with pressure, causing Doppler shifts.
    • D) Higher pressure reduces atomic density.

    Answer: Frequent collisions perturb electron energy levels.

    Explanation: Collisional broadening masks discrete transitions. Option C confuses pressure with temperature effects.