Reply to post: Re: Speed of light

Halfords invents radio signals that don't travel at the speed of light

John Robson Silver badge

Re: Speed of light

The second is defined in relation to a specifix caesium emission isn't it. Then the metre is defined as a number of wavelengths of one of the sodium lines?

So the speed (in a vacuum) is absolutely fixed, because the speed defines the metre.

And radio waves travel at that speed, not near as dammit - actually at.

Of course that speed is modified by the transmission medium.

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