Difference between revisions of "Photon"
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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''' 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''' 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=== | ===Equations=== | ||
| − | + | ====Momentum of a Photon==== | |
<math>p = \frac{h}{\lambda}</math> | <math>p = \frac{h}{\lambda}</math> | ||
| Line 20: | Line 21: | ||
<math>h = </math> [[Planck's Constant]] (<math>6.63\times10^{-34}Js</math>) | <math>h = </math> [[Planck's Constant]] (<math>6.63\times10^{-34}Js</math>) | ||
| − | <math>\lambda =</math> The [[wavelength]] of the '''photon'''. | + | <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'''. | ||
Revision as of 10:55, 19 July 2019
Contents
Key Stage 5
Meaning
Photons (\(\gamma\)) are bosons responsible for mediating the electromagnetic interaction and are the particle associated with electromagnetic waves.
About Photons
- The photon is denoted with the lower case Greek letter \(\gamma\) (gamma).
- Photons have no mass and therefore can mediate the electromagnetic interaction over an infinite range.
- Photons carry momentum without carrying mass and are therefore able to change the direction of motion of other subatomic particles.
- Photons do not carry charge, but allow particles with charge to exchange momentum.
- Photons carry energy from one place to another.
Equations
Momentum of a Photon
\(p = \frac{h}{\lambda}\)
Where
\(p =\) The momentum of the photon.
\(h = \) Planck's Constant (\(6.63\times10^{-34}Js\))
\(\lambda =\) The wavelength of the wave associated with the photon.
Energy of a Photon
\(E = hf\)
Where
\(E =\) The energy of the photon.
\(h = \) Planck's Constant (\(6.63\times10^{-34}Js\))
\(f =\) The frequency of the wave associated with the photon.
The Speed of Light
\(E = hf\)
Where
\(c =\) The speed of light (\(3.00\times10^{8}ms^{-1}\) in a vacuum)
\(\lambda =\) The wavelength of the wave associated with the photon.
\(f =\) The frequency of the wave associated with the photon.