P1.6.3 Communications

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  • Created by: Maddi
  • Created on: 02-05-14 23:52
Why do we use radio waves of different frequencies for different purposes?
Radio waves of different frequencies are used for different purposes because the wavelength (and frequency) of waves affects: how far they go, how much they spread and how much information they carry.
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How are radio waves produced?
By applying an alternating voltage to an aerial.
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Which waves do we use for satellite TV?
Microwaves.
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What are optical fibres?
Optical fibres are very thin glass fibres.
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What do we use optical fibres for?
We use them to transmit signals carried by visible light and infrared radiation.
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How do optical fibres work?
The signals travel down the fibre by repeated total internal reflection.
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Why are optical fibres so useful in communications?
They carry much more information and are more secure than radio wave and microwave transmissions
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Other cards in this set

Card 2

Front

How are radio waves produced?

Back

By applying an alternating voltage to an aerial.

Card 3

Front

Which waves do we use for satellite TV?

Back

Preview of the front of card 3

Card 4

Front

What are optical fibres?

Back

Preview of the front of card 4

Card 5

Front

What do we use optical fibres for?

Back

Preview of the front of card 5
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