What is an eco?

An echo is a sound or sounds caused by the reflection of sound waves from a surface back to the listener.
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A repetition of original sound because of reflection by some surface is called echo
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When a sound travel and come return it is called as eco but there are some conditions

1. The room should be empty
2. There should be no furnitures in room
3. It sould be a big hall
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The echo is a reflection of sound which is heard many times and it causes when stand in front of a smooth and a hard surface and the minimum distance for heating an echo is17.2m
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