Quote:
Originally Posted by circumpolar
Agree.
That is, When we are talking about velocity I agree.
But remember we are talking about speed here, wich has a specific meaning.
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Velocity is speed in a particular direction. In reference to your question the terms are interchangeable.
If the question is simply asking is there a difference in the speed (velocity) of light, between light and radio waves in vacuum, and between light and radio waves in air, then refraction, different trajectories in a the medium etc are not relevant.
Seems like the question has been made unnecessarily complicated.
Regards
Steven