Question

Can we hear an echo when the distance is 18 meters ?​

Answer 1

Explanation:

Since the building in this case, is at a distance of 18 m, we can hear the reflected sound clearly. We thus get a clear echo in this case.

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Answer 2

Answer:

Since the building, in this case, is at a distance of 18 m, we can hear the reflected sound clearly. We thus get a clear echo in this case.