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At 1:48 PM -0800 2/9/04, John Denker wrote:
This is an object lesson in the perils of plug-and-chug,
or to say the same thing in more positive terms, a lesson
in the importance of knowing the domain of applicability
and validity of a formula.
That derivation and the resulting formula  make some
sense in the context of a running wave. They make no sense
whatsoever in the context of a standing wave.
But the standing wave is the superposition of the running wave and
it's reflection. Why do you say that it makes no sense whatsoever
(aside from the Q that you mention)? -- Wolfgang