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I haven't looked at the video in a couple of years, since I quit
I don't see how this "immediately follows" unless one refers to the
relativistic Doppler shift formula. It certainly isn't true for
sound. But if there is a simple argument that has eluded me, I'd
like to hear it. Hewitt offers none and even if these is one, I'd be
surprised to find that the result is "obvious" to the target student
population unless it is "obvious" for all the wrong reasons--e.g.,
"1/2 is the inverse of 2."