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Q.

The sound heard after reflection is called :

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a

Echo

b

Ultrasonic

c

Infrasonic

d

Supersonic

answer is C.

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Detailed Solution

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Sound is the result of disturbances or oscillations of particles about their mean position. When sound waves strike a surface and they bounce back, an echo is heard.
Therefore, we can say that the sound heard after reflection is called an echo.

 

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