The modulation can change either the amplitude or the frequency of the carrier wave. The carrier wave is modulated (varied) in direct proportion to the signal (e.g., voice or music) that is to be transmitted. So how does a radio wave carry sounds such as voice or music to your radio receiver? The radio station broadcasts a carrier wave at the station's assigned frequency. AM radio signals are carried by medium frequency (MF) radio waves (530 to 1710 kilohertz (kHz) in North America, 530 to 1610 kHz elsewhere), and FM radio signals are carried by very high frequency (VHF) radio waves (88 to 108 megahertz (MHz)). Radio waves are divided into many sub-classifications based on frequency. Electromagnetic radiation at frequencies ranging from 3 hertz (Hz) to 300 gigahertz (GHz) are classified as radio waves. For example, electromagnetic radiation at frequencies between about 430 terahertz (THz) and 750 THz can be detected by the human eye and are perceived as light. In a vacuum, electromagnetic waves travel at the speed of light.Įlectromagnetic waves such as light, x-rays, and radio waves are classified by their frequency or wavelength. Electromagnetic radiation is a propagating wave in space with electric and magnetic components. When you listen to an AM or FM radio station, the sound that you hear is transmitted to your radio by the station using electromagnetic radiation as a carrier-radio waves. For example, light is electromagnetic radiation and so are x-rays. Electromagnetic radiation is all around us.
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