For a particular metal, we can conduct the photoelectric experiment with monochromatic light of different frequencies, to obtain the stopping potentials *V*_{s} at each frequency *f*. We now have the necessary data to plot a graph of *KE*_{max} (calculated from *KE*_{max} = *eV*_{s}) against *f*.

Since , plotting *KE*_{max} against *f* should result in a straight line graph, with the gradient and y-intercept corresponding to *h* and –*Φ* respectively.

If we plot one graph for each metal, we will obtain parallel lines, all with gradient equals to *h*, with graphs of higher work-function metlas sitting lower since the y-intercepts correspond to –*V*_{s}.

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