the reflecting back of sound is called echo
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Just like light, the sound gets reflected at the surface of a solid or liquid. This bouncing back of sound when it strikes any surface is the reflection of sound. Repetition of sound caused by the reflection of the sound wave is called as an echo.
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Echo is the sound heard after reflection from a distant obstacle after the original sound has ceased. It is often heard at high altitudes because of the large distances between the mountains.
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