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Question

Which of the following electromagnetic waves is used in telecommunication?


A

radio waves

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B

visible radiations

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C

ultraviolet rays

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D

microwaves

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Solution

The correct option is D

microwaves


Option D.

  1. Microwave radiation has wavelengths between one meter and one millimeter, which correspond to frequencies between 300MHz and 300GHz, respectively.
  2. Prior to the development of fiber-optic transmission, carriers like AT&T Long Lines operated networks of microwave radio relay links that carried the majority of long-distance phone calls.
  3. Starting in the early 1950s, frequency-division multiplexing was utilized to transmit up to 5,400 telephone channels on each microwave radio channel.
  4. For the hop to the next site, which might be up to 70km away, as many as ten radio channels were multiplexed into one antenna.

Therefore, Microwaves are used in telecommunication. Hence, Option D is correct.


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