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10 February, 03:31

Which of the following electromagnetic waves are not used for communication? a. gamma rays b. microwaves c. infrared waves d. radio waves

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  1. 10 February, 07:09
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    Gamma rays are not used for communication.

    - - We have no safe way to generate them.

    - - We have no cheap way to detect them.

    - - We have no way to impress information on them (modulate them).

    - - They're dangerous.

    Otherwise they're ideal for communication.
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