• German physicist Max Planck (1858-1947) studied the emission of light by hot objects.
  • A quantum is the minimum quantity of energy that can either be lost or gained by an atom.
  • Planck showed that the amount of radiant energy absorbed or emitted by an object is directly proportional to the frequency of the radiation.
  • A small energy change results in the emission or absorption of low-frequency radiation.
  • While the resulting energy may seem very small, this is for only one photon of light.
  • Visible quantities of light consist of huge quantities of photons.
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