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Q.

A stone is dropped into a well in which the level of water is h below the top of the well. If v is velocity of sound, the time T after which the splash is heard is given by

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a

T=2hv

b

T=h2g+2hv

c

T=2hg+hv

d

T=2hv+hg

answer is B.

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Detailed Solution

Time taken by the stone to reach the water level

         t1=2hg

Time taken by sound to come to the mouth of the well, t2=hv

      ∴ Total time t1+t2=2hg+hv         

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