Radio

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 accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. This is the range from a few tens of hertz to a few hundred gigahertz.

Related Topics:
Charged - Accelerate - Radio frequency - Electromagnetic spectrum - Hertz

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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.

Related Topics:
Infrared - Light - Ultraviolet - X-ray - Gamma ray - Photon - Electron - Atom - Non-ionizing radiation

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Radio transmission diagram and electromagnetic waves.

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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. Although the word 'radio' is used to describe this phenomenon, the transmissions which we know as television, radio, radar, and cell phone are all classed as radio frequency emissions.

Related Topics:
Aether - Transformed - Television - Radar

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