Energy contained within the incident light is absorbed by electrons within the metal, giving the electrons sufficient energy to be 'knocked' out of, that is, emitted from, the surface of the metal.
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Energy contained within the incident light is absorbed by electrons within the metal,giving the electrons sufficient energy to be 'knocked' out of, that is, emitted from, the surface of the metal. So the light wave incident on a surface induces its energy into the electrons and this causes electrons to get excited.
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