The photon is an elementary massless particle representing a quantum of electromagnetic radiation, or light. Albert Einstein was instrumental in developing the concept of the particle nature of light and, in fact, received his Nobel Prize for using the quantum nature of light to explain the photoelectric effect.
Electrons are also elementary particles. Unlike photons, they have mass and charge. Electrons are also sub-atomic particles (along with protons and neutrons).
Tuesday, September 21, 2010
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