Question

define term echo what minimum distance is required to hear it​

Answer 1

hyy mate ✌️

An echo is heard only if the distance between the person producing sound and the rigid obstacle is long enough to allow the reflected sound to reach the person atleast 0.1 second after the original sound is heard

hope it will help you ❣️

Answer 2

An echo is heard only if the distance between the person producing sound and the rigid obstacle is long enough to allow the reflected sound to reach the person atleast 0.1 second after the original sound is heard.