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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.
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Iowa HospitalsPhysicians in Iowa
I used to love Owl City but Fireflies playing every 5 seconds on the radio kind of made me sick of it.
MayreeGrace (Mary Grace) Fri, 18 Dec 2009 12:56:11 -0000
I used to love Owl City but Fireflies playing every 5 seconds on the radio kind of made me sick of it.
Radio head juara1 ngeleh keun es duren na pa aip.RT @anggie_rama: high n dry........damn http://myloc.me/2aKU6
Abu_Arians (Abu Arians) Fri, 18 Dec 2009 12:56:05 -0000
Radio head juara1 ngeleh keun es duren na pa aip.RT @anggie_rama: high n dry........damn http://myloc.me/2aKU6
ad mir? DIMANA?!RT @dhynz92: astagaaaa ini siaran radio apa acara gulat sih? si Mir teriak2 autis banget!LOL <3
vaniasays (Vania Agustine Putri) Fri, 18 Dec 2009 12:56:03 -0000
ad mir? DIMANA?!RT @dhynz92: astagaaaa ini siaran radio apa acara gulat sih? si Mir teriak2 autis banget!LOL <3
Senado aprova projeto que obriga União a indenizar vÃtimas da talidomida. Ouça em www.senado.gov.br/radio
RadioSenado (Rádio Senado) Fri, 18 Dec 2009 12:56:02 -0000
Senado aprova projeto que obriga União a indenizar vítimas da talidomida. Ouça em www.senado.gov.br/radio
http://bit.ly/YYvc5 StockPreacher Initiates Independent Research Coverage for Sirius XM Radio Inc. - CNNMoney.com (... http://ow.ly/16b0cJ
TwtrTraffic (Tweeter Traffic) Fri, 18 Dec 2009 12:55:58 -0000
http://bit.ly/YYvc5 StockPreacher Initiates Independent Research Coverage for Sirius XM Radio Inc. - CNNMoney.com (... http://ow.ly/16b0cJ
RT @40GLOCC @Chubbylme yep maken radio edits for new video local boy wit @sun_days
Sun_Days (sun) Fri, 18 Dec 2009 12:55:57 -0000
RT @40GLOCC @Chubbylme yep maken radio edits for new video local boy wit @sun_days
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