Einstein’s photoelectric equation is expressed as:
Where, =maximum kinetic energy of the photoelectron.
=maximum velocity of photoelectron.
m= mass of emitted photoelectron.
= frequency of light radiation.
= work function.
= Planck’s constant.
If is the threshold frequency, then the work function can be written as,
According to the photoelectric equation,
Let the maximum kinetic energy for wavelength of the incident be,
From equation (i) and (ii), we get;
Work function is the energy required to eject photoelectron from the metal.
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