A) \[T=\sqrt{\frac{2h}{g}}+\frac{h}{v}\]
B) \[T=2\sqrt{\frac{2h}{g}}\]
C) \[T=\frac{2h}{v}\]
D) \[T=\sqrt{\frac{2h}{g}}\times \frac{h}{v}\]
Correct Answer: A
Solution :
Required time = time taken by stone to reach the water surface + time taken by sound to reach the top. \[=\sqrt{\frac{2h}{g}}+\frac{\eta }{v}\]
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