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NEET Sample Paper NEET Sample Test Paper-43

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

    A) \[h\left[ \sqrt{\frac{2}{gh}}+\frac{1}{c} \right]\]              

    B) \[h\left[ \sqrt{\frac{2}{gh}}-\frac{1}{c} \right]\]

    C) \[h\left[ \frac{2}{g}+\frac{1}{c} \right]\]             

    D) \[h\left[ \frac{2}{g}-\frac{1}{c} \right]\]

    Correct Answer: A

    Solution :

    Time of fall \[=\sqrt{\frac{2h}{g}}\] Time taken by the sound to come out \[=\frac{h}{c}\] Total Time= \[\sqrt{\frac{2h}{g}}+\frac{h}{c}=h\left[ \sqrt{\frac{2}{hg}}+\frac{1}{c} \right]\]


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