Light of frequency 
is incident on a substance of threshold frequency 
. The energy of the emitted photo-electron will be
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Einstein explained the phenomenon of photo- electric effect on the basis of Plancks theory. According to which the kinetic energy of photoelectrons emitted from the metal surface is 
and 
is the work function of the metal, then
where 
is the energy of the photon absorbed by the electron in the metal. If for a given metal, the threshold frequency of light be 
then an amount of energy 
of the photon of light will be spent in ejecting the electron out of the metal.
ie, 
(ii)
From Eqs. (i) and (ii), we get
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