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JEE Main & Advanced Sample Paper JEE Main Sample Paper-15

  • question_answer
    If the Young's modulus of material of rod is \[2\times {{10}^{11}}N/{{m}^{2}}\] and density is 8000 kg/m3, what is the time taken by sound wave to travel 1 m of the rod?

    A) \[{{10}^{-4}}\sec \]                         

    B) \[{{10}^{-2}}\sec \]

    C) \[2\times {{10}^{-4}}\sec \]                        

    D) \[2\times {{10}^{-2}}\sec \]

    Correct Answer: C

    Solution :

    \[V=\sqrt{\frac{Y}{\rho }}=\sqrt{\frac{2\times {{10}^{11}}}{8000}}=\frac{{{10}^{4}}}{2}=5000\,\text{m/s}\] \[\text{t}=\frac{1}{5000}\text{m/s}=2\times {{10}^{-4}}\sec \]


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