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JEE Main & Advanced Sample Paper JEE Main - Mock Test - 40

  • question_answer
    Two boys stand close to a long straight metal pipe and at some distance from each other. One boy fires a gun and the other hears two explosions, with a time interval of one second between them. If the velocity of sound in metal is \[3630\text{ }m\text{ }{{s}^{-1}}\] and in air is \[330\text{ }m\text{ }{{s}^{-1}}\] the distance between the two boys is

    A) 36.3 m

    B) 726 m

    C) 363 m

    D)        3630 m

    Correct Answer: C

    Solution :

    [c] \[\frac{\ell }{330}-\frac{\ell }{3630}=1\] \[(3630-330)\ell =330\times 3630\] or, \[\ell \frac{330\times 3630}{3300}m=363\,m\]


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