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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.

More on [ Radio ]

Television and Radio - Twitter Search

Anyone want to be Chair of Radio and Television Arts at Ryerson? http://bit.ly/5FEehu Also, Chair of Journalism: http://bit.ly/8qnFCn
elthenerd (Elaine) Fri, 25 Dec 2009 19:01:26 -0000
Anyone want to be Chair of Radio and Television Arts at Ryerson? http://bit.ly/5FEehu Also, Chair of Journalism: http://bit.ly/8qnFCn
Daily guide to television and radio http://bit.ly/8nz6Yl
FoodMedic (Gary Novosel) Fri, 25 Dec 2009 18:32:38 -0000
Daily guide to television and radio http://bit.ly/8nz6Yl
Health Tips Daily guide to television and radio: Soprano Renée Fleming; chef Johnny Iuzzini; car-safety tips for t... http://bit.ly/7slnyr
docimo (Suzanne Docimo) Fri, 25 Dec 2009 17:18:45 -0000
Health Tips Daily guide to television and radio: Soprano Renée Fleming; chef Johnny Iuzzini; car-safety tips for t... http://bit.ly/7slnyr
OPENING JANUARY 2010. The MAX MILLIONZ ENTERTAINMENT AGENCY, INC. TELEVISION and RADIO STUDIO. Telecast World wide.
Max_Millionz (Max Millionz) Fri, 25 Dec 2009 16:43:57 -0000
OPENING JANUARY 2010. The MAX MILLIONZ ENTERTAINMENT AGENCY, INC. TELEVISION and RADIO STUDIO. Telecast World wide.
Daily guide to television and radio http://bit.ly/8lhcXU
Jaydeegun (Jerry Gunning) Fri, 25 Dec 2009 13:47:08 -0000
Daily guide to television and radio http://bit.ly/8lhcXU
Daily guide to television and radio http://bit.ly/7slnyr
CheatingGossip (Arla VanGough) Fri, 25 Dec 2009 13:14:41 -0000
Daily guide to television and radio http://bit.ly/7slnyr

 

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