Radio waves have the longest wavelengths in the electromagnetic spectrum. These waves can be longer than a football field or as short as a football. Radio waves do more than just bring music to your radio. They also carry signals for your television and cellular phones.
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 and refracted to change their direction. These properties make them ideal for communications.
They are used in standard broadcast radio and television, shortwave radio, navigation and air-traffic control, cellular telephony, and even remote-controlled toys. (For a fuller treatment, see electromagnetic radiation: Radio waves.)
How Radio Waves Work. When a transmitter sends a wave, it takes a receiver set to the same wave vibration to get that wave to turn into sound, data, pictures, or whatever. Radio waves need a transmitter and a receiver. Depending on the length of a radio wave, the frequency, or 'channel' it travels on changes.
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