Photoelectric effect - Brian Cox - Which phenomena show the particle nature of light? -

When light shines on a metal, electrons can be ejected from the surface of the metal in a phenomenon known as the photoelectric effect. This process is also often referred to as photoemission, and the electrons that are ejected from the metal are called photoelectrons. In terms of their behavior and their properties, photoelectrons are no different from other electrons. The prefix, 'photo', simply tells us that the electrons have been ejected from a metal surface by incident light.
In this video particle physicist, Brian Cox explains the experiment and phenomena of photoelectric effect that led to the idea of light behaving as a particle of energy called a photon.

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