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Originally Posted by Ken G
I think elastic just means no change in frequency in the scatterer frame. But terminology tends to evolve to fit a particular application.
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Thanks. That makes sense. I get the feeling scattering is no easy subject. I only found, and ordered, one book on it of possible worth at Amazon. Its about 750 pages written by.... S. Chandrasekhar. It should be a quick read. [I doubt I'll get beyond page 10 or so.

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