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Wave frequency and photon energy Waves4.4 Quantum physics4.5 Photons4.5.1
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Course idea

Photons

OCR A AS Physics · 4.5.1

Explore photons within quantum physics. Some interactions transfer energy in discrete amounts. Photon energy links frequency to the photoelectric effect, while diffraction reveals the wave behaviour of particles.

Specification outcomes (6)
  • 4.5.1(a) Describe the particulate (photon) nature of electromagnetic radiation.
  • 4.5.1(b) Define a photon as a quantum of energy of electromagnetic radiation.
  • 4.5.1(c) Use E = hf and E = hc / λ to calculate energy of a photon.
  • 4.5.1(d) Define the electronvolt (eV) as a unit of energy.
  • 4.5.1(e)(i) Use LEDs and eV = hc / λ to estimate the value of Planck’s constant.
  • 4.5.1(e)(ii) Determine Planck’s constant using different coloured LEDs experimentally.
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H156 v2.0 · May 2026

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