Electromagnetic waves ranging in frequencies between 1 ghz and 300 ghz are called
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Infrared waves, with frequencies from 300 GHz to 400 THz (wavelengthsfrom 1 mm to 770 nm), can be used for short-range communication. ... In addition, we cannot use infrared wavesoutside a building because the sun's rays contain infrared waves that can interfere with the communication
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