Which of the following principle is used in the echo?

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Diffraction of sound waves

The reflection of sound waves

The refraction of sound waves

Scattering of sound waves

answer is A.

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Detailed Solution

Echo is based on the principle of reflection of sound
An echo is a sound produced when sound waves are reflected off of a surface and returned to the listener. It is the sound that has been reflected, and it reaches the listener after the original sound has passed.
Due to the lag between the initial sound and its return from the reflecting surface, the sound is heard more than once.

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