Difference between revisions of "Microwave"
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===About Microwaves=== | ===About Microwaves=== | ||
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: [[Microwave]]s are [[Transverse Wave|transverse waves]]. | : [[Microwave]]s are [[Transverse Wave|transverse waves]]. | ||
: [[Microwave]]s can travel through a [[vacuum]] as well as through [[gas]]es in the [[Earth's Atmosphere|Earth's atmosphere]]. | : [[Microwave]]s 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]] - [[Microwave]]s can bounce off an [[interface]] between two [[medium|media]]. | *[[Reflection|Reflected]] - [[Microwave]]s can bounce off an [[interface]] between two [[medium|media]]. | ||
*[[Refraction|Refracted]] - [[Microwave]]s can change direction when they cross the [[interface]] between two [[medium|media]]. | *[[Refraction|Refracted]] - [[Microwave]]s can change direction when they cross the [[interface]] between two [[medium|media]]. | ||
| + | ====Unique Properties==== | ||
| + | : [[Microwave]]s can cause alternating currents in [[metal]]s. | ||
| + | : [[Microwave]]s can cause [[water]] [[molecule]]s to [[oscillate]], [[heating]] the [[water]]. | ||
====Applications==== | ====Applications==== | ||
: [[Microwave]]s can be used in communication because they can be created by [[Alternating Current|alternating current]] and can cause an [[Alternating Current|alternating current]] in [[metal]]s. | : [[Microwave]]s can be used in communication because they can be created by [[Alternating Current|alternating current]] and can cause an [[Alternating Current|alternating current]] in [[metal]]s. | ||
Revision as of 22:33, 20 February 2019
Contents
Key Stage 4
Meaning
Microwaves are the second lowest frequency and second longest wavelength electromagnetic waves.
About Microwaves
- Microwaves are transverse waves.
- Microwaves can travel through a vacuum as well as through gases in the Earth's atmosphere.
- The speed of microwaves through a vacuum is 300,000,000m/s.
As a wave microwaves can be:
- Transmitted - Microwaves can pass through a medium.
- Absorbed - The energy transferred by microwaves can be taken in by certain materials, particularly metals.
- Reflected - Microwaves can bounce off an interface between two media.
- Refracted - Microwaves can change direction when they cross the interface between two media.
Unique Properties
- Microwaves can cause alternating currents in metals.
- Microwaves can cause water molecules to oscillate, heating the water.
Applications
- Microwaves can be used in communication because they can be created by alternating current and can cause an alternating current in metals.
- Microwaves can be used for cooking because they cause water molecules and fat molecules to oscillate increasing the temperature of the food.
Dangers
- Microwaves can cause internal heating of living creatures because they are made of water which is heated by microwaves.