> > Hmmmm. Seems to me that the visible wave represents one aspect of wave motion > and the actual sound we could hear if we stuck our heads underwater would > represent another aspect of the whole induced motion thing. > Joseph Alkana RPT Joseph, Certainly, but what induces the motion in the first place? Will a compression wave introduced directly into the water at a molecular level without displacing water make ripples like a tossed in rock? The wave produced will be a compression wave, and travel at the speed of sound in water, not a transverse surface wave traveling much more slowly because it won't displace water like a rock in a pond, or the soundboard surface like a string moved bridge in a piano. Some mass in an elastic membrane has to be displaced perpendicular to the plane of the membrane to get a transverse wave. I know how the moving mass of the rock or string does it, but how would a molecular level compression wave do that? That's the question. Ron N
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