Question
Tue March 05, 2013 By:

.THE SOUND OF A EXPLOSION ON THE SURFACE OF LAKE IS HEARD BY A BOATMAN 100m AWAY AND A DIVER 100m BELOW THE POINT OF EXPLOSION. i)who will hear sound first boatman or diver? why?

Expert Reply
Tue March 05, 2013
time to reach the sound to the boatman=t1=100/340=0.29s
time to reach the sound to the diver=t2=100/v where v is speed of sound in lake water.
as vin lake will be always be greater than the speed of sound in air.
so t2<t1
so the boat man will hear the sound first.
Home Work Help