Einstein's Photoelectric Equation

Physics

definition

Einstein's photoelectric equation

Einstein's photoelectric equation :

The kinetic energy of the photoelectron coming out may be anything between zero and where is the energy supplied to the individual electrons.


diagram

Plot of stopping potential vs frequency of incident light

We know the relation of stopping potential with frequency is 

where is the work function of the metal.
If we want to plot the stopping potential vs frequency , it will be a straight line with slope and negative y intercept

diagram

Interception of the plot

  • Slope: From the above graph we can see that the slope of the graph is constant,i.e.,
  • Intercept: The intercept is . This is negative y intercept. This intercept depends upon work function of the metal, . More the work function, more will be the magnitude of the intercept. 

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