Difference between revisions of "Microwave"

Revision as of 17:08, 8 November 2019

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 satellite communication and mobile phone 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.

References

AQA

Microwaves, page 79, GCSE Physics; The Revision Guide, CGP, AQA

Microwaves, pages 193-195, GCSE Physics; Third Edition, Oxford University Press, AQA

Microwaves, pages 194, 195, 198-9, GCSE Physics, Hodder, AQA

Microwaves, pages 200, 205, GCSE Combined Science Trilogy; Physics, CGP, AQA

Microwaves, pages 223, 224, GCSE Combined Science; The Revision Guide, CGP, AQA

Microwaves, pages 242, 247, GCSE Physics; The Complete 9-1 Course for AQA, CGP, AQA

Microwaves, pages 261, 267, GCSE Combined Science Trilogy 2, Hodder, AQA

Microwaves; uses and applications, page 200, GCSE Physics, Hodder, AQA

@@ Line 21: / Line 21: @@
 ====Dangers====
 : [[Microwave]]s can cause internal heating of living creatures because they are made of [[water]] which is heated by [[microwave]]s.
+===References===
+====AQA====
+:[https://www.amazon.co.uk/gp/product/178294558X/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=178294558X&linkCode=as2&tag=nrjc-21&linkId=f0dfb66dafcb0c6e9449e7b1a4ae1ac313 ''Microwaves, page 79, GCSE Physics; The Revision Guide, CGP, AQA '']
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