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Message: [QUOTE="CL82, post: 4014833, member: 44"] It's really definitional. Is sound the movement of air or the impact of that movement on a human ear drum? The latter is kind of silly standard since we know animals can hear, but that is how the question is traditionally posed. I used the former definition as a given in my proof, so the proof was largely irrelevant. The givens decided the issue. The professor wasn't sophisticated enough to spot it otherwise he would challenged me on the givens. [/QUOTE]