EM Waves and Communication. Flashcards
(7 cards)
1
Q
Describe the EM waves with different wavelengths.
A
Different wavelengths - different properties.
Group them into7 basic types.
Merge to form a continuous spectrum
2
Q
Size of wavelength.
A
Vary from around 10-15m to 104m.
3
Q
Speed of wavelengths.
A
Travel at the same speed in a vacuum.
3 x 108 m/s.
4
Q
Radio wave size.
A
1 m - 10 power of 4 m.
5
Q
Gamma ray size.
A
10 power of -15 m.
6
Q
What are radio waves.
A
Em radiation with wavelengths longer than about 10 cm.
7
Q
Describe long wave radio.
A
Can be transmitted from London and received from half way around the world .
They can diffract around the curved surface.
Diffract around hills into tunnels.
