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An **energy-frequency graph** that arises from the photoelectric effect. The maximum **kinetic energy** \(W_{\text{kin}}\) of an electron is plotted on the vertical axis and the **frequency** \(f\) of the light is plotted on the horizontal axis. The photons of the light are used to eject the electrons for example from a metal plate.

In the photoelectric effect, the kinetic energy depends linearly on the light frequency. This results in a straight line in the graph. From the straight line, we can determine the **cutoff frequency** \(f_0\) (x-axis intercept) and the **work function** \(W\) (y-axis intercept). These quantities tell us which material is irradiated with light.

From the slope of the straight line the physical constant \(h\) (**Planck's constant**) can be calculated.