Explain the laws of photoelectric effect with the help of Einstein's Photoelectric Equation?

Photoelectric effect is the phenomenon of emission of electrons from the surface of certain photosynthesis materials when light waves with particular frequency and sufficient energy fall on them.

Consider a photon of light frequency ν incident on a photosensitive metal surface. The energy of the photon (= hν) can be used in two ways: 

(i) To liberate the electron from the metal surface (Φ= Work function) 

(ii) The rest of the energy of the photon is used in imparting the maximum kinetic energy kmax to the emitted photoelectrons.

 It was first observed by Heinrich Hertz. Visible light produces photoelectric effect on alkali metals.

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