Question

Velocity of sound in the atmosphere of a planet is500ms-1.The minimum distance between the source of sound and the obstacle to hear the echo, should be

Answer 1

Answer:

Explanation:

Let the distance between the source of sound and the obstacle be x metres .

Thus the distance travelled by sound to reach back to the source   d=2x

As the minimum time required to hear an echo is equal to 0.1sec

Thus  d=vt

2x=500(0.1)⟹x=25m