Question

The phenomenon of echo of sound waves is due to:

• A. Reflection
• B. Interference
• C. Diffraction
• D. All of the above

Answer 1

The correct option is A Reflection

Answer is A.
Like all waves, sound waves can be reflected. Sound waves suffer reflection from the large obstacles. As a result of reflection of sound wave from a large obstacle, the sound is heard which is named as an echo. Ordinarily echo is not heard as the reflected sound gets merged with the original sound. Certain conditions have to be satisfied to hear an echo distinctly (as a separate sound).
Hence, the phenomenon of echo of sound waves is due to reflection.