What this topic covers

Quantum physics is topic 22 of the Cambridge 9702 syllabus (2025–2027), covering the energy and momentum of a photon, the photoelectric effect, wave–particle duality, and energy levels and line spectra. It is A Level content, examined in Paper 4 (A Level Structured Questions), which carries 38.5% of the A Level. Students most often struggle to explain why the photoelectric effect provides evidence for the particulate nature of electromagnetic radiation, to use threshold frequency and work function correctly, and to recognise that maximum kinetic energy depends on frequency rather than intensity. Electron diffraction and the de Broglie wavelength, together with transitions between discrete energy levels, complete the topic. Explanations here must be precise, as vague descriptions rarely earn credit.

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Questions in this topic

• 9702/41/O/N/24 Q8 — photoelectric effect · 9 marks
• 9702/42/O/N/24 Q9 — electron diffraction and de Broglie wavelength · 9 marks
• 9702/43/O/N/24 Q8 — photoelectric effect · 9 marks
• 9702/42/M/J/24 Q8 — emission spectrum and Hubble's law · 12 marks
• 9702/43/M/J/24 Q8 — X-rays and photons · 13 marks
• 9702/41/O/N/23 Q8 — Photon momentum and pressure · 10 marks
• 9702/42/O/N/23 Q8 — photoelectric effect · 8 marks
• 9702/43/O/N/23 Q8 — Photon momentum and pressure · 10 marks
• 9702/41/M/J/23 Q7 — de Broglie wavelength and electron diffraction · 9 marks
• 9702/42/M/J/23 Q8 — energy levels and photon transitions · 8 marks
• 9702/43/M/J/23 Q7 — de Broglie wavelength and electron diffraction · 9 marks
• 9702/42/F/M/23 Q7 — energy levels and spectra · 7 marks
• 9702/41/O/N/22 Q8 — photoelectric effect · 10 marks
• 9702/42/O/N/22 Q9 — hydrogen emission spectrum · 13 marks
• 9702/43/O/N/22 Q8 — photoelectric effect · 10 marks
• 9702/41/M/J/22 Q7 — photoelectric effect · 10 marks
• 9702/42/M/J/22 Q8 — Wave-particle duality · 8 marks
• 9702/43/M/J/22 Q7 — photoelectric effect · 10 marks
• 9702/42/F/M/22 Q8 — de Broglie wavelength and electron diffraction · 7 marks
• 9702/41/O/N/21 Q10 — wave-particle duality · 9 marks
• 9702/42/O/N/21 Q9 — photoelectric effect · 9 marks
• 9702/43/O/N/21 Q10 — wave-particle duality · 9 marks
• 9702/41/M/J/21 Q6 — Electric fields and de Broglie wavelength · 8 marks
• 9702/41/M/J/21 Q12 — photoelectric effect · 8 marks
• 9702/42/M/J/21 Q5 — Electric potential and photoelectric effect · 9 marks
• 9702/42/M/J/21 Q12 — photon and momentum · 9 marks
• 9702/43/M/J/21 Q6 — Electric fields and quantum physics · 8 marks
• 9702/43/M/J/21 Q12 — photoelectric effect · 8 marks
• 9702/42/F/M/21 Q11 — X-ray production and absorption · 10 marks
• 9702/42/O/N/20 Q7 — X-ray emission · 6 marks

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