Difference between revisions of "Infra-red"
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: [[Infra-red]] can be used in [[Thermal Imaging|thermal imaging]] because [[object]]s emit [[infra-red]] [[radiation]] due to their [[temperature]]. The higher the [[temperature]] the more [[infra-red]] they [[emit]]. | : [[Infra-red]] can be used in [[Thermal Imaging|thermal imaging]] because [[object]]s 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 [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] the food. | : [[Infra-red]] can be used to cook food because it can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] the food. | ||
| + | : [[Infra-red]] can be used in [[Fibre Optics|fibre optic]] communication because it is not [[Absorb (Physics)|absorbed]] by the [[glass]] that the fibres are made from. | ||
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====Dangers==== | ====Dangers==== | ||
: [[Infra-red]] can cause skin burns because it can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] the [[material]]. | : [[Infra-red]] can cause skin burns because it can cause [[atom]]s and [[molecule]]s to [[vibrate]], [[heating]] the [[material]]. | ||
Revision as of 14:32, 6 March 2019
Contents
Key Stage 4
Meaning
Infra-red 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.
- Infra-red can be used in fibre optic communication because it is not absorbed by the glass that the fibres are made from.