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Creation Day One: "Let there be light!"
Radio waves have the longest wavelengths of all light waves. Radio waves have wavelengths as long as a thousand meters (10 football fields) and as short as a few millimeters (width of a human hair). Radio waves frequencies range between 3,000 waves/second (kHz or a thousand hertz) and 1 billion waves/sec (tHz or a terahertz). Various frequencies of radio waves are used for television and FM and AM radio broadcasts, military communications, radio telescopes, wireless computer networks, and numerous other communications applications.
Microwaves are basically extremely high frequency radio waves . Their wavelength's range is from 30 centimeters to a 1 millimeter. We can use microwaves to cook many types of food. Microwaves cause the water and fat molecules in food to rapidly vibrate, which makes the foods and liquids placed inside the microwave ovens hot. Mobile phones use microwaves. This means that mobile phone companies need to have many transmitter towers if they're going to attract customers. WiFi and satellite dish receivers also use microwaves. Microwaves are also used by fixed traffic speed cameras, and for radar, which is used by aircraft, ships and weather forecasters.
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