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Draw a graph showing the variation of stopping potential with frequency of radiation incident on the metal plate? How can the value of plank's constant be determined from the graph?

Einstein's photoelectric equation in terms of stopping potential Vsis


where ?o is the work function

           ? = frequency of incident radiation.

The graph of stopping potential Vs versus frequency of incident radiation is shown in the figure.


The slope of the graph in

Therefore by measuring slope of Vo - ? graph, the value of Planck's constant,

                           h = ex (slope of Vo - ? graph).

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