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Heinrich Hertz proved the existence of radio waves in the late 1880s
Starting from British physicist James Maxwell’s theory of electromagnetic waves, Italian electrical engineer Guglielmo Marconi created the first practical radio transmission and reception system c 1894.
Radio Control Applications
Radio Controlled Toy
The primary application of radio waves is in radio and television broadcasting.
Transmission methods may vary from satellite to radio transmission towers
Radio communication is also used by military during peacetime and wartime
Remote control toys, garage openers apply radio frequency technology
Cellular phones, wireless clocks etc
Space communication is also done using this technology
Magnetic Resonance Imaging (MRI) uses radio waves to produce cross-sectional images of organs and other internal body structures thus avoiding exposure to radiations like X-rays
RFID tags identify items by transmitting radio waves which can be picked up by a reader.
Sweetsearch a handy web search tool...
* Radio waves constiute waves in the electromagnetic spectrum at frequencies lower than microwaves.
* Wavelengths range from few thousand meters to around 30 cm and correspond to frequencies from 3 Hz to as high as 1GHz