Discussion
Which of the following statements about the propagation speed of communication channels is correct?
Answer: A
All operate at nearly the same propagation speed.
Microwaves and radio waves are both electromagnetic and travel at \(3\times10^{8}\ \mathrm{m\,s^{-1}}\) in air. Light in an optical fibre goes at \(c/n\), about two-thirds of that, so fibre is if anything slightly slower - its advantage is enormous bandwidth, not speed.
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