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E=hf

Photoelectric Effect

  • Emission of charged particles when exposed to UV light
  • Electrons
  • Einstein suggested light is quantised
  1. The maximum KE of ejected electrons is independent of intensity, but dependent on frequency n
  2. There is a minimum frequency n0below which there is no emission
  3. No time delay (less than 1 ns) before the onset of emission –but the rate of electrons depends on the intensity.

!photo-electric.png !fermi-vacuum-level.png

!em-spectrum.png

  • Radio spectrum
    • 30Hz – 300 GHz