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Energy from photons (eg .UV photons) is absorbed by a metal (work function).
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When a photon enters the metal, it gets absorbed by an electron.
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The electron then uses this energy as kinetic energy in order to release itself (eg. jump over a vacuum) which then creates a current.
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The more intense the UV light, the higher the current will be. (More UV photons being absorbed by more electrons.)
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One to one ratio. One photon is absorbed by one electron.
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