Answers

2016-03-10T12:29:04+05:30
Echo:
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The sound heard after reflection from a rigid obstacle is called an echo.

Reverberation :
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Reverberation is the "repeated reflection of sound waves" that results in persistence of sound for sometimes.
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2016-03-10T13:14:30+05:30
a sound or sounds caused by the reflection of sound waves from a surface back to the listener is called echo

prolongation of a sound resonance is called reverberation

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