Photoelectric effect

  • Thread starter saiarun
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Main Question or Discussion Point

How the Concept of Photoelectric effect proved that the light acts as a particle? Considering the fact that even the electron exist as waves, Can't the superposition of the light waves and the electron waves result in the ejection of the photo electron.
Thanking you in advance.
 

Answers and Replies

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chroot
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When you shine photons on a metal, electrons are ejected -- but only if the photons have enough energy. If you increase the intensity of a monochromatic light source, you get more electrons, but they all still have the same energy. The only way to get higher-energy electrons out is to use higher-frequency light.

The only explanation which fits these observation is that light is quantized into discrete packets, photons, and only one photon interacts with a given electron.

- Warren
 

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