Question

An echo is not heard in a small room but it can be heard in hills near ravines. why ?

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Answer 1

Answer:

So, the reason that echoes aren't heard in rooms is that the reflected sounds are received in less than 0.1 seconds, or the reflecting surfaces are at distances of less than 17 meters. Reverberations can also be heard in an empty apartment.

Answer 2

Answer:

They can't hear an echo in small room because in it the sound can't be reflected back. For an echo of a sound to be heard..

Explanation:

hope it helps