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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]].
: '''Photons''' carry [[energy]] from one place to another.
===Equations===
<math>p = \frac{h}{\lambda}</math>
<math>h = </math> [[Planck's Constant]] (<math>6.63\times10^{-34}Js</math>)
<math>\lambda =</math> The [[wavelength]] of the [[Electromagnetic Wave|wave]] associated with the '''photon'''. ====Energy of a Photon==== <math>E = hf</math> Where <math>E =</math> The [[energy]] of the '''photon'''. <math>h = </math> [[Planck's Constant]] (<math>6.63\times10^{-34}Js</math>) <math>f =</math> The [[frequency]] of the [[Electromagnetic Wave|wave]] associated with the '''photon'''. ====The Speed of Light==== <math>E = hf</math> Where <math>c =</math> The speed of [[light]] (<math>3.00\times10^{8}ms^{-1}</math> in a [[vacuum]]) <math>\lambda =</math> The [[wavelength]] of the [[Electromagnetic Wave|wave]] associated with the '''photon'''. <math>f =</math> The [[frequency]] of the [[Electromagnetic Wave|wave]] associated with the '''photon'''.