Question

How far away is the cliff from the child, if a child hears an echo from a cliff 6 second after the sound produced by powerful horn? The velocity sound in air at 22^oC is 344 m/s.

• A. 688 m
• B. 1000 m
• C. 58 m
• D. 1032 m

Answer 1

The correct option is D

1032 m

Let the distance between cliff and child be d m. Then, total distance traveled by the sound = 2d, Total time taken = 6 s

Then, velocity of sound = 2d/6s = d / 3 s

344 m/s = d / 3 s

d = 344 m/s x 3 s = 1032 m