Which of the following statements is not true with respect to microwaves?
(A) Electromagnetic waves with frequencies from 300 GHz to 400 THz.
(B) Propagation is line-of-sight.
(C) Very high-frequency waves cannot penetrate walls.
(D) Use of certain portions of the band requires permission from authorities.
Explanation: Electromagnetic waves with frequencies not ranges from 300 GHz to 400 THz. It ranges from (0.3 to 300) GHz. So, I option is Incorrect.
Propagation is line-of-sight.Correct
Very high-frequency waves cannot penetrate walls.Correct
Use of certain portions of the band requires permission from authorities.Correct
So, option (A) is correct.
Quiz of this Question
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