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Q.

A ball is dropped into a well in which the water level is at a depth h below the top. If the speed of sound is c, then the time after which the splash is heard will be given by

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a

h2gh+1c

b

h2gh−1c

c

h2g+1c

d

h2g−1c

answer is A.

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Detailed Solution

Time of fall =2hgTime taken by the sound to come out =hcTotal time =2hg+hc=h2gh+1c
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