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Edexcel A-Level Physics Photoelectric Evidence

Practise Edexcel A-Level Physics photoelectric-effect evidence through threshold observations, photon packets and particle-model explanations.

Syllabus
Pearson Edexcel International Advanced Subsidiary/Advanced Level
Course
Physics XPH11/YPH11
Level
AS

Exam points

  • use immediate photoelectron emission to argue for one-photon one-electron energy transfer
  • compare intensity and frequency observations against wave and particle models of light
  • identify the photoelectric effect as evidence for the photon model of electromagnetic radiation

2.3.62 - Photoelectric effect evidence question 1

[Maximum number: 3]

The diagram shows the energy levels for an atom of hydrogen.

Figure for Question 2.3.62 - Photoelectric effect evidence question 1 — Edexcel A-Level Physics AS

Photons with energy 1.63imes10−18 J1.63 imes10^{-18}\,\mathrm{J} are incident on a metal plate. The surface releases electrons due to the photoelectric effect.

Explain why the photoelectric effect demonstrates light behaving as a particle, rather than a wave.

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