Behaviour and uses of electromagnetic waves

The behaviour of an electromagnetic wave in a substance depends on its frequency. The differing behaviours of different groups in the electromagnetic spectrum make them suitable for a range of uses.

Radio waves

Radio waves are used for communication such as television and radio. Radio waves are transmitted easily through air. They do not cause damage if absorbed by the human body, and they can be reflected to change their direction. These properties make them ideal for communications.

Radio waves can be produced by oscillationsin electrical circuits. When radio waves are absorbed by a conductorthey create an alternating current. This electrical current has the same frequency as the radio waves. Information is coded into the wave before transmission, which can then be…