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MGIMS WARDHA MGIMS WARDHA Solved Paper-2012

  • question_answer
    A stone is dropped in 19.6 m depth well, echo is heard in 2.06 s, then velocity of sound is

    A)  315.2 m/s                          

    B)  320.5 m/s

    C)  326.7 m/s                          

    D)  332.4 m/s

    Correct Answer: C

    Solution :

                    Time taken by stone to touch water \[t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2\times 19.6}{9.8}}=2s\] Time taken by echo to reach observer \[=2.06-2=0.06\text{ }s\] \[\therefore \] Velocity of sound\[v=\frac{19.6}{0.06}=\text{ }326.7\text{ }m/s\]


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