________ are very efficient in a frequency range of 3-300 GHz.

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Mr. Dubey

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📊 Electromagnetic Field

Q. ________ are very efficient in a frequency range of 3-300 GHz.

(A) Transmission line
(B) Wave guides
(C) Both (a) and (b)
(D) None of these

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✅ Correct Answer: (B) Wave guides

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