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It is an observation that many metals emit electrons when light is focused on them
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and these electrons are called photoelectrons
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Hertz performed the photoelectric effect experiment.

Electrons are ejected by metals like potassium, rubidium,caesium when they are exposed to a beam of light. The electrons are ejected from a clean surface of metal.

Photoelectric effect is observed when the frequency of light is more than a threshold frequency. The energy of electrons emitted increases with the frequency of light.

The number of electrons ejected is proportional to the intensity of light.

Einstein explained the effect with the help of Planck's quantum theory.

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