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A particle that has no rest mass, no electrical charge and
whose energy is determined by its electromagnetic wavelength. A photon is
considered to be an amount of electromagnetic radiation energy that is
proportional to the frequency of that radiation. It may also be considered as a
particle of light with energy, hv, where h is Planck's constant and v is the
frequency of light.
[New Scientist; v143; 16-17; 1994.] [Science; v262;
1008-1009; 1993.] [Atmospheric Science; J. Wallace and P. Hobbs; page 281; 1977;
Academic Press, Inc; New York.]
- A quantum (or packet) of energy emitted in the form of electromagnetic
radiation. Gamma rays and x-rays are examples of photons.
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