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Quantum physics

WJEC 1420QS — matched to your course.

Photons, the photoelectric effect, de Broglie waves and spectra.

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Determining Planck's constant using LEDs

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Subtopics and study areas

  • Measure LED threshold voltages for different wavelengths and use photon energy to estimate Planck's constant.
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Quantum physics

Revision notes are free. Premium unlocks the full question and retrieval-card bank.

Subtopics and study areas

  • Use E = hf = hc/λ and convert between joules and electronvolts.
  • Explain the photoelectric effect using photons and work function.
  • Apply de Broglie's relation and interpret line spectra.
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