A man standing 300m away from the wall sounds a whistle. The echo from the wall reaches him 1.8sec. later. Calculate the velocity of sound in air?

A. 540.0ms−¹
B. 333.3ms−¹
C. 270.0ms−¹
D. 166.7ms−¹
E. 83.3ms−¹

Correct Answer:

Option B – 333.3ms−¹

Explanation

V = 2x/t=2×300/1.8

= 333.33ms−¹