A man stands at a distance of 189 m away from a wall. He shoots a rifle and hears an echo after 2.1 sec. Calculate the Velocity of sound.
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Total distance covered by the sound wave to come back to to rifleman ,
d=50+50=500m ,
total time taken by the sound wave to come back to rifleman after reflection from the wall , to produce an echo ,
t=1.5s
therefore , velocity of sound ,
v=d/t=500/1.5=333.33m/s
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