Which phenomenon is responsible for the echo of sound wave?

Options

A. Reflection
B. Refraction
C. Interference
D. Polarisation

Answer

A

Explanation

Reflection of sound waves off of surfaces lead to one of two phenomena - an echo or a reverberation. The echo is produced due to hitting of the sound waves with the obstacles which makes the sound to reflect back.Echoes occur when a reflected sound wave reaches the ear more than 0.1 seconds after the original sound wave was heard.