Microwaves & Infrared
This lesson covers:
- The two main uses of microwaves
- The main uses of infrared radiation
shorter / longer
Microwaves and infrared waves have wavelengths than visible light.
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Some frequencies of microwaves can be absorbed by water molecules.
Other frequencies of microwaves cannot be absorbed by water molecules.
Microwaves that can be absorbed by water molecules are used for:
Microwave ovens
Seeing animals in the dark
Satellite communication
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Microwaves that cannot be absorbed by water molecules are used for:
Microwave ovens
Seeing animals in the dark
Satellite communication
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some / all / heat
Infrared radiation is emitted from objects that have thermal energy.
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True or false? Higher temperature objects emit less infrared radiation than lower temperature objects.
True
False
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Infrared cameras specialise in spotting live organisms because:
(Select all that apply)
Animals are warmer than the surrounding environment and therefore emit more infrared radiation
Infrared cameras can detect the infrared radiation emitted by animals
Animals are attracted to infrared camera
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Infrared r can be used to cook food and heat a room.
Both rely on h metal to a very high t.
The hot metal e a lot of infrared radiation.
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