1. The use of radio waves and signals beyond radio broadcasting By Chadney Bigby

3. They transmit through free space by modulation of electromagnetic waves with frequencies below those of light.

4. The frequencies can range from 300GHz to as low as 3kHz.

5. They travel at the speed of light, naturally occurring radio waves are made by lightning.

7. Depending on the information that is being sent AM works by varying the strength of the of the transmitted signal.

8. In telecommunications and signal processing FM varies its frequency to send information over a carrier wave.

10. It is normally used for minimally invasive surgeries like the treatment of sleep apnea.

11. The waves are also used as Magnetic resonance imaging (MRI) uses radio frequencies to produce images of the human body.

13. Radio telescopes focus on a point by using conducting metal that reflects radio waves.

14. To make images of comparable clarity the radio telescope must physically be larger than an optical telescope.

16. In modern times radio takes up many forms in everyday live.

17. They are used in daily devices such as mobile phones, wireless networks, radio broadcasting and television

19. When a mobile is near the edge of a cell and moves into another cell's coverage area it will switch cell sites to continue the call.

20. Phones originally used FM but the have now changed and use digital modulation.

22. Analogue television uses vestigial side-band to reduce the bandwidth required

23. Vestigial side-band is a method used in analogue video transmitted in AM due to large bandwidth. It is a side-band that has been partially been cut off or suppressed

25. This happens because a wireless transmitter sends and recirves from the internet through the broadband connection.

26. The information is converted into radio waves by the transmitter and then sends it.

28. http://people.csail.mit.edu/rudolph/Teaching/L2-2.pdf

29. http://en.wikipedia.org/wiki/Amplitude_modulation

30. http://en.wikipedia.org/wiki/Frequency_modulation

31. http://en.wikipedia.org/wiki/Vestigial_sideband#Vestigial_sideband_.28VSB.29

32. http://www.bbc.co.uk/webwise/guides/about-wifi