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: '''Photons''' carry [[momentum]] without carrying [[mass]] and are therefore able to change the direction of motion of other [[Subatomic Particle|subatomic particles]].
: '''Photons''' do not carry [[Electrical Charge|charge]], but allow [[Subatomic Particle|particles]] with [[Electrical Charge|charge]] to exchange [[momentum]].
===Equations===
: The equation for the [[momentum]] of a '''photon''' is:
<math>p = \frac{h}{\lambda}</math>
Where
<math>p =</math> The [[momentum]] of a the '''photon'''.
<math>h = </math> [[Planck's Constant]] (<math>6.63x10^{-34}Js</math>)
<math>\lambda =</math> The [[wavelength]] of the '''photon'''.