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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.

Radio waves

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Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.

ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum

Other types of electromagnetic radiation, with frequencies above the RF range, are infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
Electromagnetic spectrum and diagram of radio transmission of an audio signal.

Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.

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Now playng: #TheYellowjackets ♫ Dewey (A Trib... ♫ on #RJSJazzRadio-SFL.com http://ow.ly/iAqQ. #jazz #radio #southflorida #musicsunday
RJSJazzRadioSFL (RJSJazzRadio.com) Sun, 03 Jan 2010 10:15:05 -0000
Now playng: #TheYellowjackets ♫ Dewey (A Trib... ♫ on #RJSJazzRadio-SFL.com http://ow.ly/iAqQ. #jazz #radio #southflorida #musicsunday
Now playing "I Thank You Lord" by Southwest Michigan Choir on Malaco Gospel Radio http://bit.ly/5V4ZEe #nowplaying
malaco_music (Malaco Music Group) Sun, 03 Jan 2010 10:15:05 -0000
Now playing "I Thank You Lord" by Southwest Michigan Choir on Malaco Gospel Radio http://bit.ly/5V4ZEe #nowplaying
4314 Streaming the @public_timline This is @public_timeline radio http://bit.ly/txG59
timelineradio (TimeLine Radio) Sun, 03 Jan 2010 10:14:52 -0000
4314 Streaming the @public_timline This is @public_timeline radio http://bit.ly/txG59
@RachelCorinne i sent him a pix that i took w/ him in front of the radio station...asked if it was cute enough to get him to follow me. LOL
miss_tattoo (Laurina ♥ Tattoo ♥) Sun, 03 Jan 2010 10:14:48 -0000
@RachelCorinne i sent him a pix that i took w/ him in front of the radio station...asked if it was cute enough to get him to follow me. LOL
@ChrisChilvers Was at hospital radio from 15-20 years old. 1st show at KL.FM was Sept 11th attacks. Did 6 months of cover before moving away
ednell (Ed Nell) Sun, 03 Jan 2010 10:14:46 -0000
@ChrisChilvers Was at hospital radio from 15-20 years old. 1st show at KL.FM was Sept 11th attacks. Did 6 months of cover before moving away
Now playing "I Love You" by Marvin Sease on Southern Soul Radio http://bit.ly/8Njvi1 #nowplaying
malaco_music (Malaco Music Group) Sun, 03 Jan 2010 10:14:42 -0000
Now playing "I Love You" by Marvin Sease on Southern Soul Radio http://bit.ly/8Njvi1 #nowplaying

 

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