Answers

2016-01-23T07:24:16+05:30
Echo is a distinct reflected sound which can be heard clearly by us i.e. there must be a minimum gap of 34 meters between source and the reflecting medium!

While multiple reflection doesn't need to be distinctively heard by us as the reflector can be at a distance of less than 34 meters also. In this case, we won't hear the sound clearly.
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