Ex: when you first look at a house or an empty apartment and you can hear an echo. I clear out my bathroom of all items to clean and I hear the echo. I put everything back in its place and the echo is gone??
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Sound moves in waves/vibrations away from the source and can bounce off things it interacts with. (hits)
so think of sound moving like a thrown rubber ball, its easier to bounce from wall to wall in an empty room, but if there is curtains and carpet, it looses quite a bit of bounce off those things, and the other items (furniture and plants) deflect the travel path as well, so it cant bounce back and forth nearly as many times or in straight lines.
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