Difference between revisions of "Radiowave"
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: [[Radiowave]]s can pass through many non-metals unaffected. | : [[Radiowave]]s can pass through many non-metals unaffected. | ||
| + | ====Making Radiowaves==== | ||
| + | : [[Radiowave]]s are made by [[Alternating Current|alternating currents]]. This can be used to broadcast signals. The [[radiowave]]s will then induce an [[Alternating Current|alternating current]] in an antenna. | ||
====Applications==== | ====Applications==== | ||
: [[Radiowave]]s can be used in communication including radio broadcasts and television broadcasts because they can be created by [[Alternating Current|alternating current]] and can cause an [[Alternating Current|alternating current]] in [[metal]]s. | : [[Radiowave]]s can be used in communication including radio broadcasts and television broadcasts because they can be created by [[Alternating Current|alternating current]] and can cause an [[Alternating Current|alternating current]] in [[metal]]s. | ||
====Dangers==== | ====Dangers==== | ||
: There are no dangers of [[radiowave]]s. | : There are no dangers of [[radiowave]]s. | ||
Revision as of 11:15, 22 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.
- Refracted - Radiowaves can change direction when they cross the interface between two media.
Unique Properties
- Radiowaves can cause alternating currents in metals.
- Radiowaves can pass through many non-metals unaffected.
Making Radiowaves
- Radiowaves are made by alternating currents. This can be used to broadcast signals. The radiowaves will then induce an alternating current in an antenna.
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.