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Transmission media used for medium frequency band are

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Transmission media used for medium frequency band are

(a) Coaxial cable

(b) Copper cable

(c) Optical fiber

(d) All of the mentioned

I have been asked this question in an international level competition.

My question is from Digital Communication System in portion Signals and Spectra of Digital Communications

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The correct option is (b) Copper cable

To elaborate: For medium frequency band communication air and copper cable can only be used as a transmission medium.

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