Uses of EM Waves

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What are radio waves?
EM radiation with wavelengths longer than 10cm
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How can radiowaves be used for broadcasting?
Long wave radio, wavelengths of 1-10km, long waves diffract (bend) around the earth and can be transmitted around the world. TV and FM radio broadcasting, short wavelengths so have to be in sight of transmitter (10cm-10m), can't bend
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What are shortwave radio signals?
Wavelengths of about 10-100m, can be received at long distances, reflected from ionosphere, an electricall charged layer in the earth's atmosphere
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How can microwaves be used?
For satellite communication; 1-10cm wavelengths, passes through earths atmosphere, to satellite, to earth, used for phones and tv
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How is infrared radiation used?
For heating and to monitor temperature, the hotter the object, the more IR given out
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How can IR be detected?
Using night vision equipment, which detects the IR and turns it into an electric signal, e.g. catching criminals on the run
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How do optical fibres work?
By bouncing waves off the sides of a very narrow core, visible light rays, pulse of the light enters the fibre at a certain angle and is reflected again until it reaches the other end, used for telephone and broadband
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How does visibld light work in photography?
Cameras use a lens to focus visible light onto a light sensitive film or sensor
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How is ultraviolet used?
Flourescence is where UV light is absorbed by chemicals and then visible light is emitted.
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How are X-Rays used?
To view the internal structure of objects and materials,the x-ray radiation is directed through the object to a detector plate, the brighter bits are where fewer x-rays get through
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What can gamma radiation be useful for?
Sterilizing medical equipment, kills microbes
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Other cards in this set

Card 2

Front

How can radiowaves be used for broadcasting?

Back

Long wave radio, wavelengths of 1-10km, long waves diffract (bend) around the earth and can be transmitted around the world. TV and FM radio broadcasting, short wavelengths so have to be in sight of transmitter (10cm-10m), can't bend

Card 3

Front

What are shortwave radio signals?

Back

Preview of the front of card 3

Card 4

Front

How can microwaves be used?

Back

Preview of the front of card 4

Card 5

Front

How is infrared radiation used?

Back

Preview of the front of card 5
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