Two men at a distance of 0.68 km from each other stand at the same distance from a vertical hillock. One of them fires a shot and the other hears it’s echo 3 s after hearing the direct sound. Find the distance of the men from the hillock assuming the velocity of the sound to be 340 metre per second.
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Total distance covered by the sound and its reflection = 2d
where d is the distance between vertical hillock and one of the man.
Time taken for the echo to be heard = 3 s
Let the speed of sound in air be 340 m/s.
We know , Speed = Distance /time
340 = 2d/ 3
d = 510 m
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