Minimum distance between the observer and the obstacle for echo to be

1.	Minimum distance between the observer and the obstacle for echo to be heard
Answer» MINIMUM distance between the observer and the OBSTACLE for the ECHO to be HEARD clearly should be 17.2 m.and the TEMPERATURE should be 25°c

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Minimum distance between the observer and the obstacle for echo to be heard​

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Minimum distance between the observer and the obstacle for echo to be heard