# Illustration Capacitor with set stopping voltage for photoelectric effect

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A plate capacitor consists of two electrodes (capacitor plates). A stopping voltage $$U_{\text G}$$ is set between the electrodes.

An electrode is now irradiated with photons of the energy $$h \, f$$. The photons land on the electrode surface and eject electrons. Because of the applied stopping voltage, the electrons are decelerated (stopped) by the negatively charged capacitor plate.

If the stopping voltage is set in such a way that no electrons arrive at the opposite electrode, we can use this method to find out the maximum velocity of the ejected electrons or the work function of the illuminated material!