MDCAT Physics MCQ #318

Why do spectral lines from high-pressure gases appear broader than those from low-pressure gases?

MDCAT Physics MCQ #318

  1. Question 1

    Q1. Why do spectral lines from high-pressure gases appear broader than those from low-pressure gases?

    • A) Collisions perturb energy levels temporarily.
    • B) High-pressure gases emit more photons simultaneously.
    • C) Temperature increases with pressure, causing Doppler shifts.
    • D) Gas density affects photon escape probabilities.

    Answer: Collisions perturb energy levels temporarily.

    Explanation: Collisional broadening occurs from perturbed states. Option C confuses pressure effects with Doppler broadening.