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Which of the following electromagnetic waves is not used for communication? A.Gamma rays B.Microwaves C.Infrared Waves D.Radio Waves
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Which of the following electromagnetic waves is not used for communication? A.Gamma rays B.Microwaves C.Infrared Waves D.Radio Waves

User NYCeyes
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We have no safe way to generate gamma rays, no cheap or convenient way to detect them, no easy way to make them carry information, and they are dangerous. So they're not a favorite for communication. The other 3 choices are all popular.
User Henna
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