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===About Photons===
: The '''photon''' is denoted with the lower case Greek letter <math>\gamma</math> (gamma).
: '''Photons''' carry [[energy]] from one place to another.
: '''Photons''' have no [[mass]] or [[Electrical Charge|charge]]
===About Virtual Photons===
: '''Virtual photons''' a [[model]] for the mechanism of action of the [[Electromagnetic Interaction|electromagnetic interaction]], but they are not strictly 'real'.
: '''Virtual photons''' have no [[mass]] and therefore can mediate the [[Electromagnetic Interaction|electromagnetic interaction]] over an infinite range.
: '''Virtual photons''' carry [[momentum]] without carrying [[mass]] and are therefore able to change the direction of motion of other [[Subatomic Particle|subatomic particles]].
: '''Virtual photons''' do not carry [[Electrical Charge|charge]], but allow [[Subatomic Particle|particles]] with [[Electrical Charge|charge]] to exchange [[momentum]].
===Equations===
====The Speed of Light====
<math>E c = hff\lambda</math>
Where
<math>f =</math> The [[frequency]] of the [[Electromagnetic Wave|wave]] associated with the '''photon'''.
===Examples===
{| class="wikitable"
|+The '''virtual photon''' is shown mediating the [[Electromagnetic Interaction|electromagnetic interaction]].
|[[File:FeynmanDiagramProtonProton.png|center|300px]]
|[[File:FeynmanDiagramElectronElectron.png|center|300px]]
|-
| style="height:20px; width:300px; text-align:center;" |This [[Feynman Diagram]] shows the [[Electromagnetic Interaction|electromagnetic interaction]] between two [[proton]]s exchanging [[momentum]] via the '''virtual photon'''.
| style="height:20px; width:300px; text-align:center;" |This [[Feynman Diagram]] shows the [[Electromagnetic Interaction|electromagnetic interaction]] between two [[electron]]s exchanging [[momentum]] via the '''virtual photon'''.
|}
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/019835939X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=019835939X&linkCode=as2&tag=nrjc-21&linkId=57e96876985fc39b1a3d8a3e3dc238b6 ''Photons, page 95, GCSE Physics; Third Edition, Oxford University Press, AQA '']
====OCR====
:[https://www.amazon.co.uk/gp/product/0198359837/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359837&linkCode=as2&tag=nrjc-21&linkId=3c4229e8b023b2b60768e7ea2307cc6f ''Photons, pages 178-179, Gateway GCSE Physics, Oxford, OCR '']