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Radio waves travel through ________

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Radio waves travel through ________

(a) Coaxial Cable

(b) Wires

(c) Optical fiber cable

(d) Electromagnetic waves

I got this question in exam.

My question is taken from Need of Transducers topic in chapter Receivers & Transducers of Analog Communications

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Correct option is (d) Electromagnetic waves

To explain: Radio communication or wireless communication takes place through electromagnetic waves. The message is transmitted through open space via electromagnetic waves or radio waves.

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