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This is the best explaination I can come up with to try and explain this concept while still keeping it in simple enough terms so it will be understood



oh boy... you know, try me...

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IR energy (heat) absorbs soundwaves



this statement is sensles. energy can not absorb any freaking thing. you didn't have to go quoting anything.

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sound waves always widen as they travel distances and bounce around off things- thus lowering the frequency in hz


this is another example. the waves don't widen, for a very simple reason that this would violate the basic laws of physics. if you told me that high frequency waves are absorbed easier, or scattered more than low frequence, then I would agree.

you are still very far from an explanation of rasp. so go on...