The frequency of light must be greater than the cut off frequency to emit the electrons from the material .
Frequency is the number of occurrence of a repeating event per unit of time.
Frequency = 1/Time period
The SI unit of Frequency is Hz (Hertz).
The kinetic energy of photoelectron equal to
E = hv - work function
where E is the kinetic energy of the photo electron
h is planks constant h = 6.67× [tex]$10^{-34}[/tex]
v is cut off frequency
Work function is the minimum energy need for the emission of electrons from material .So , as frequency goes higher than the cut off frequency , kinetic energy of the electrons increase as well.
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