Radio Waves are Used Mainly for Communications Flashcards
1
Q
What are radio waves?
A
EM radiation with wavelengths longer than about 10cm
2
Q
What can be done to long-wave radio signals?
A
They can be transmitted a long way because long wavelengths are bent around the curved surface of the earth
3
Q
What can be done to short-wave radio signals?
A
They can be received at long distances from the transmitter because they are reflected from the ionosphere (layer of earths atmosphere)
4
Q
How long are the radio waves used for TV and FM radio broadcasting?
A
They have very short wavelengths
5
Q
What do you need to do to get reception from these radio waves?
A
You must be in direct sight of the transmitter - the signal doesn’t bend around hills
6
Q
Look at the diagram page 29
A
Ok
