Question

What is echo ?????????

Answer 1

The result of reflection of sound waves (or other waves), usually by a hard surface. The sensation of sound persists in our brain for about 0.1 s. To hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.1 s.

Answer 2

Echo is a sound or sounds caused by the reflection of sound waves from a surface back to the listener..