Question

Draw a graph showing the variation of stopping potential with frequency of incident radiations in relation to photoelectric effect. Deduce an expression for the slope of this graph using Einstein's photoelectric equation.

Answer 1

Graph between stopping potential V₀ and frequency v is as shown in figure.

According to Einstein photoelectric equation

eV = hv - W₀ ...........(1)

where W₀ is the work function and is constant for a substance.
Differentiating equation (i) partially, we get