The sound of an exploison on the surface of lake is heard by a boatman 100m away and a diver 100m below the point of exploison. Of the two persons mentioned who would hear tbr sound first and why
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For the boatman above the surface of water...
speed of sound in air = 344 m/s
distance covered = 100 m
time taken by sound = t sec
velocity = distance / time
344 = 100 / t
t = 100 / 344
t = 0.29 sec
Now, for the man below the surface of water
speed of sound in water = 1533 m/s
distance covered = 100 m
time taken = t
But velocity = distance / time
1533 = 100 / t
t = 100 / 1533
t = 0.06 sec
So , the man under the water hear the sound of the explosion first....
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