Difference between revisions of "Radiowave"
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===About Radiowaves=== | ===About Radiowaves=== | ||
: [[Radiowave]]s [[transmit]] the least [[energy]] of all the [[Electromagnetic Wave|electromagnetic wave]]s. | : [[Radiowave]]s [[transmit]] the least [[energy]] of all the [[Electromagnetic Wave|electromagnetic wave]]s. | ||
| + | : [[Radiowave]]s are [[Transverse Wave|transverse waves]]. | ||
| + | : [[Radiowave]]s can travel through a [[vacuum]] as well as through [[gas]]es in the [[Earth's Atmosphere|Earth's atmosphere]]. | ||
| + | : The [[speed]] of [[radiowave]]s through a [[vacuum]] is 300,000,000[[m/s]]. | ||
| + | As a [[wave]] [[radiowave]]s can be: | ||
| + | *[[Transmit|Transmitted]] - [[Radiowave]]s can pass through a [[medium]]. | ||
| + | *[[Absorb (physics)|Absorbed]] - The [[energy]] [[Energy Transfer|transferred]] by [[radiowave]]s can be taken in by certain [[material]]s, particularly [[metal]]s. | ||
| + | *[[Reflection|Reflected]] - [[Radiowave]]s can bounce off an [[interface]] between two [[medium|media]]. This can be either [[Diffuse Reflection]] or [[Specular Reflection]]. | ||
| + | *[[Refraction|Refracted]] - [[Radiowave]]s can change direction when they cross the [[interface]] between two [[medium|media]]. | ||
====Properties==== | ====Properties==== | ||
: [[Radiowave]]s can cause alternating currents in [[metal]]s. | : [[Radiowave]]s can cause alternating currents in [[metal]]s. | ||
Revision as of 22:16, 20 February 2019
Contents
Key Stage 4
Meaning
Radiowaves are the lowest frequency and longest wavelength electromagnetic waves.
About Radiowaves
- Radiowaves transmit the least energy of all the electromagnetic waves.
- Radiowaves are transverse waves.
- Radiowaves can travel through a vacuum as well as through gases in the Earth's atmosphere.
- The speed of radiowaves through a vacuum is 300,000,000m/s.
As a wave radiowaves can be:
- Transmitted - Radiowaves can pass through a medium.
- Absorbed - The energy transferred by radiowaves can be taken in by certain materials, particularly metals.
- Reflected - Radiowaves can bounce off an interface between two media. This can be either Diffuse Reflection or Specular Reflection.
- Refracted - Radiowaves can change direction when they cross the interface between two media.
Properties
- Radiowaves can cause alternating currents in metals.
- Radiowaves can pass through many non-metals unaffected.
Applications
- Radiowaves can be used in communication including radio broadcasts and television broadcasts because they can be created by alternating current and can cause an alternating current in metals.
Dangers
- There are no dangers of radiowaves.