Waveguides are used mainly for microwave signals because

1.	Waveguides are used mainly for microwave signals because
A.	They depend on straight-line propagation which applies to microwaves only
B.	Losses would be too heavy at lower frequencies
C.	There are no generators powerful enough to excise them at lower frequencies
D.	They would be too bulky at lower frequencies
Answer» E.

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Waveguides are used mainly for microwave signals because

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