MDCAT Physics MCQ #329

Why do absorption spectra show dark lines at specific wavelengths?

MDCAT Physics MCQ #329

  1. Question 1

    Q1. Why do absorption spectra show dark lines at specific wavelengths?

    • A) Photons are re-emitted in random directions
    • B) Electrons absorb photons and transition to higher energy levels
    • C) Atoms undergo nuclear fission
    • D) Photons are deflected by intermolecular forces

    Answer: Electrons absorb photons and transition to higher energy levels

    Explanation: Absorption occurs when electrons move to excited states; A fails because re-emission doesn’t create dark lines.