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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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Radio - Twitter Search

add goog iphone free program : 5-0 Radio Pro 5.0 http://apps.su/p/6486/
appssu (apps) Wed, 06 Jan 2010 08:23:17 -0000
add goog iphone free program : 5-0 Radio Pro 5.0 http://apps.su/p/6486/
I'm gonna need yall help starting next month to call da radio to request da new single "I Dont Care" FT @NAN510BAYAREA & @DzynedByFace
calizoe (calizoe Yea I Go) Wed, 06 Jan 2010 08:23:15 -0000
I'm gonna need yall help starting next month to call da radio to request da new single "I Dont Care" FT @NAN510BAYAREA & @DzynedByFace
Launching Kenya-Bongo Internet Radio soon!
dylanx5 (martin indiatsi) Wed, 06 Jan 2010 08:23:15 -0000
Launching Kenya-Bongo Internet Radio soon!
The season finale of "Radio Free Krakow" is now also available on Youtube! http://www.youtube.com/watch?v=g4qyVeVG574&feature=youtube_gdata
roguenation (Rogue Nation Studios) Wed, 06 Jan 2010 08:23:14 -0000
The season finale of "Radio Free Krakow" is now also available on Youtube! http://www.youtube.com/watch?v=g4qyVeVG574&feature=youtube_gdata
Flurin Caviezel in «Grischa-Lüüt»: In der Radio-Grischa-Sendung «Grischa-Lüüt» gastiert am Sonntag Kabarettist .. http://bit.ly/6dCIdw
radioengiadina (Radio Engiadina) Wed, 06 Jan 2010 08:23:12 -0000
Flurin Caviezel in «Grischa-Lüüt»: In der Radio-Grischa-Sendung «Grischa-Lüüt» gastiert am Sonntag Kabarettist .. http://bit.ly/6dCIdw
Good man @DamianOS3. Waxing lyrical about iPhone on national radio. Apps.ie got a plug too!
dermdaly (Dermot Daly) Wed, 06 Jan 2010 08:23:09 -0000
Good man @DamianOS3. Waxing lyrical about iPhone on national radio. Apps.ie got a plug too!

 

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