You clap your hands, and instantly you hear an echo of the clap. What does this tell you about the size of the room?
If you hear an echo when you clap this should tell you that the space is a very large one.
These are the sounds that are repeated after a first sound has been made. The echo is usually a repetition of a noise.
When the room is very large and empty then the echo would be there. This would not happen in a confined space.
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