Question

when is echoe heard​

Answer 1

Explanation:

An echo is a sound that is repeated because the sound waves are reflected back. Sound waves can bounce off smooth, hard objects in the same way as a rubber ball bounces off the ground. Although the direction of the sound changes, the echo sounds the same as the original sound.

Answer 2

Answer:

Echos can be heard in small spaces with hard walls like wells or spaces where there are so many hard objects...