In a message dated 04/01/02 4:11:27 PM, fordpiano@lycos.com writes: << But I'm still a bit sceptical about the idea of waves bouncing back from the rim. This is a variation on what I've been conjecturing about in previous posts. >> Well back to the pebble in the pond analogy....if'n y'all throws a pebble in da pond the waves will travel away from the pebbles impact point until they meet a point of resistance they can't overcome...at that point the energy will be reversed and a and a corresponding, and identical, wave will begin it's journey back toward the point of origination and any other point that the surface of resistant determines by the angle of impact. If the point of resistance is a rock cliff face the most energy will be reflected back to the impact point...if the point of resistance is a pebble beach a very fragmented pattern will be returned...if the impact point is a wide bed of weeds most all the energy will be soaked up by the weeds and almost none, if any, will be reflected back. Energy works in the same manner in all mediums unless 'forced' to do otherwise by design. Jim Bryant (FL)
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