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Q.

Which of the following principle is used in the echo?

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a

The reflection of sound waves

b

The refraction of sound waves

c

Diffraction of sound waves

d

Scattering of sound waves

answer is A.

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Detailed Solution

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  • 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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