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Physics Hard CSS FPSC PPSC Uploaded: 13 Jul 2026

Which effect describes the emission of electrons from a metal surface when light of sufficient frequency falls on it?

  • A Compton effect
  • B Zeeman effect
  • C Photoelectric effect
  • D Doppler effect
Correct Answer: Option C — Photoelectric effect
Explanation:
The photoelectric effect describes the emission of electrons from a metal surface when light above a threshold frequency strikes it and was explained by Einstein winning him the Nobel Prize.
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