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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.
Radio waves
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 |
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.
More on [ Radio ]
United States :: North America
Radio :: Recreation
There is a radio station here in Syracuse that is already playing Christmas music 24/7, LoL.
TheALine (Ashley Apgar) Thu, 05 Nov 2009 18:24:09 -0000
There is a radio station here in Syracuse that is already playing Christmas music 24/7, LoL.
RT @Ziing_dot_com: I could tell my parents hated me. My bath toys were a toaster and a radio. - Rodney Dangerfield
rhpritchard (Dick Pritchard) Thu, 05 Nov 2009 18:24:07 -0000
RT @Ziing_dot_com: I could tell my parents hated me. My bath toys were a toaster and a radio. - Rodney Dangerfield
Just when I thought I could escape "Empire state" from the radio streams, it pops up on @Pandora... DOH!
djshakez (DJ Shakez [David T]) Thu, 05 Nov 2009 18:24:07 -0000
Just when I thought I could escape "Empire state" from the radio streams, it pops up on @Pandora... DOH!
RT@maliboo20!!Really crazy hearing my voice on the radio! That's the life of a local celebrity!!! Keep doing ya thing boo!!
Musclemonster (Antoine Hawkins ) Thu, 05 Nov 2009 18:24:07 -0000
RT@maliboo20!!Really crazy hearing my voice on the radio! That's the life of a local celebrity!!! Keep doing ya thing boo!!
The Business Net Mktg Radio Hour Live NOW. #bnmshow Guest: Tac Anderson, Waggener Edstrom Join in-866-472-5790 http://ow.ly/zCk4
mrseo (Greg Gaskill) Thu, 05 Nov 2009 18:24:05 -0000
The Business Net Mktg Radio Hour Live NOW. #bnmshow Guest: Tac Anderson, Waggener Edstrom Join in-866-472-5790 http://ow.ly/zCk4
hello mr. radio give me to me real filthy pop
henriquelrm (Henrique) Thu, 05 Nov 2009 18:23:59 -0000
hello mr. radio give me to me real filthy pop
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