Difference between revisions of "Infra-red"
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====Properties==== | ====Properties==== | ||
: [[Infra-red]] can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] a [[material]]. | : [[Infra-red]] can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] a [[material]]. | ||
| + | : [[Infra-red]] is a [[Transverse Wave|transverse waves]]. | ||
| + | : [[Infra-red]] can travel through a [[vacuum]] as well as through [[gas]]es in the [[Earth's Atmosphere|Earth's atmosphere]]. | ||
| + | : The [[speed]] of [[infra-red]] through a [[vacuum]] is 300,000,000[[m/s]]. | ||
| + | As a [[wave]] [[infra-red]]s can be: | ||
| + | *[[Transmit|Transmitted]] - [[Infra-red]]s can pass through a [[medium]]. | ||
| + | *[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[infra-red]] can be taken in by certain [[material]]s, particularly dark coloured [[material]]s. | ||
| + | *[[Reflection|Reflected]] - [[Infra-red]] can bounce off an [[interface]] between two [[medium|media]], particularly the surface of a shiny [[metal]]. | ||
| + | *[[Refraction|Refracted]] - [[Infra-red]] can change direction when they cross the [[interface]] between two [[medium|media]]. | ||
====Applications==== | ====Applications==== | ||
: Different [[frequency|frequencies]] of [[infra-red]] have different [[application]]s. | : Different [[frequency|frequencies]] of [[infra-red]] have different [[application]]s. | ||
Revision as of 22:29, 20 February 2019
Contents
Key Stage 4
Meaning
Infrared are the third lowest frequency and third longest wavelength electromagnetic waves.
About Infra-red
Properties
- Infra-red can cause atoms and molecules to vibrate, heating a material.
- Infra-red is a transverse waves.
- Infra-red can travel through a vacuum as well as through gases in the Earth's atmosphere.
- The speed of infra-red through a vacuum is 300,000,000m/s.
As a wave infra-reds can be:
- Transmitted - Infra-reds can pass through a medium.
- Absorbed - The energy transferred by infra-red can be taken in by certain materials, particularly dark coloured materials.
- Reflected - Infra-red can bounce off an interface between two media, particularly the surface of a shiny metal.
- Refracted - Infra-red can change direction when they cross the interface between two media.
Applications
- Different frequencies of infra-red have different applications.
- Infra-red is used in remote controls and night vision because it is invisible to the human eye but can be transmited through the air without being absorbed.
- Infra-red can be used in thermal imaging because objects emit infra-red radiation due to their temperature. The higher the temperature the more infra-red they emit.
- Infra-red can be used to cook food because it can cause atoms and molecules to vibrate, heating the food.