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.
1 of 7
How are radio waves produced?
By applying an alternating voltage to an aerial.
2 of 7
Which waves do we use for satellite TV?
Microwaves.
3 of 7
What are optical fibres?
Optical fibres are very thin glass fibres.
4 of 7
What do we use optical fibres for?
We use them to transmit signals carried by visible light and infrared radiation.
5 of 7
How do optical fibres work?
The signals travel down the fibre by repeated total internal reflection.
6 of 7
Why are optical fibres so useful in communications?
They carry much more information and are more secure than radio wave and microwave transmissions
Comments
No comments have yet been made