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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An echo is the result of soundwaves bouncing off the walls, just like light bounces off a mirror. When the apartment is full of items, the gets absorbed by them and/or bounces in a bunch of different directions. However when the apartment is empty, all the soundwaves bounce off the same walls, at the same time, in the same direction, creating an echo.
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