Echo of sound wave is due toSelect an answerArefractionBreflectionCdiffractionDNone of these

Understanding the Echo of Sound Waves

An echo is a reflection of sound that arrives at the listener after a delay, caused by the sound wave bouncing off a surface and returning to the source.

Explanation of Options

1. Refraction (A): This refers to the bending of sound waves when they pass through different mediums, causing a change in speed and direction. Refraction does not lead to echoes.

2. Reflection (B): This is the process where sound waves bounce off a surface. It's the primary mechanism that creates echoes when the sound waves reflect back to the listener after hitting a surface like a wall or a mountain.

3. Diffraction (C): This involves the bending of waves around obstacles and openings. It allows sound to bend around corners but does not create echoes.

4. None of these (D): This option indicates that none of the previous options correctly describe the phenomenon.

Final Selection

The correct answer is B - Reflection, as it accurately describes the process responsible for the formation of echoes in sound waves.