Question

Sometimes we hear echo of sound. Why?

Answer 1

we hear because if we shout or clap near a reflecting object a tall building or a mountan ,we will hear the same sound again a little it is the echo

Answer 2

We hear echo of sound because the sound waves get reflected from the wall.
Eg => repeating of a sound created by footsteps in an empty marble hallway.

Hope this answer helps you....
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