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How does one explain the emission of electrons from a photosensitive surface with the help of Einstein's equation?

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Explanation of emission of electrons from the photosensitive surface
Einstein's Photoelectric equation is
`hv=phi_(0)+K_("max")`
When a photon of energy hv is incident on the metal, some part of this energy is utilized as work function to eject the electron and reminaing energy appears as the kinetic energy of the emitted electon.
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