Sound Propagation

[Richard Brekne]

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John Delacour wrote:

> >Why dont you
> >describe your understandings of this in more detail. The phrase "radiate
> >acoustic energy" for example.... thats a little vague on the surface of
> >it...
>
> Its certainly on the surface of something, but vague it aint, except,
> of course, in French -- vague=wave -- in which case yes, but it's a
> lot of little vagues on the surface of it, or rather, radiating
> _from_ the surface of it.
>
>
> JD

Well, see the reason I ask is that your "radiate" seems to correspond pretty
good with Olsons description of sound board radiation in which case I see
almost the exact same description when it come to Benades description about
the longitudinal nature of transverse like surface waves. In all this you
could sort of look at these as a huge collection of tiny  ... Olson uses the
word "pumps" pushing away at the air in his description of sound board
radiation.... btw.. I read your stress waves reply to Phil and this also
points in this same direction. You said then

     "Acoustic radiation is caused by minute pressure differences at the
     surface of a body."

As for using the correct terminology JD.... wouldn't that be nice, but we are
both living on the planet earth and here people regularly redefine terms, or
redescribe the things terms refer to on such a regular basis and for no other
reason sometimes then just because they don't like the existing term, that
the whole concept of "correct terminology" is very largely in the realm of
wishful thinking.  Kinda vagues up the whole communication thingy a bit I
know... pain in the pattootey... but such is life I guess.

Your analogy with the magnets is fine. Its not my picture of the
relationships between particles that was at issue... I was asking you for
yours... makes it easier to relate to what you have to say to know where I
have you to begin with sost to speak.. :)


--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no


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