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Moved some stuff from photons, this article is much more detailed
In standard interpretations of quantum mechanics, light behaves both as a wave and as a particle. The existence of photons is now well accepted by the physics community, and its implication has gone well beyond the photoelectric effect.
In standard interpretations of quantum mechanics, light behaves both as a wave and as a particle. The existence of photons is now well accepted by the physics community, and its implication has gone well beyond the photoelectric effect.
==Physics of photons==
The Energy of a photon depends on its frequency and is given by the equation:
<math>E = hf</math>
where ''f'' is the frequency of the electromagnetic wave and ''h'' is Planck's constant and has the numerical value of <math>6.626\times10^{-34}</math>Js ([[Joule]]s times second) or <math>4.135\times10^{-15}</math>eV s (electron volts times second).
The [[momentum (physics)|momentum]] of a photon can be expressed as:
<math>
E = pc
</math>
==References==
==References==