Difference between revisions of "Infra-red"
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===About Infra-red=== | ===About Infra-red=== | ||
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: [[Infra-red]] is a [[Transverse Wave|transverse waves]]. | : [[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]]. | : [[Infra-red]] can travel through a [[vacuum]] as well as through [[gas]]es in the [[Earth's Atmosphere|Earth's atmosphere]]. | ||
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*[[Reflection|Reflected]] - [[Infra-red]] can bounce off an [[interface]] between two [[medium|media]], particularly the surface of a shiny [[metal]]. | *[[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]]. | *[[Refraction|Refracted]] - [[Infra-red]] can change direction when they cross the [[interface]] between two [[medium|media]]. | ||
| + | ====Unique Properties==== | ||
| + | : [[Infra-red]] can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] a [[material]]. | ||
====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 22:34, 20 February 2019
Contents
Key Stage 4
Meaning
Infrared are the third lowest frequency and third longest wavelength electromagnetic waves.
About Infra-red
- 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.
Unique Properties
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.