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WB JEE Medical WB JEE Medical Solved Paper-2009

  • question_answer
    The height of a waterfall is 50 m. If \[g=\text{9}\text{.8}\,\text{m}{{\text{s}}^{-2}}\] the difference between the temperature at the top and the bottom of the waterfall is

    A)  \[\text{1}\text{.17}{{\,}^{\text{o}}}\text{C}\]                                  

    B)  \[\text{2}\text{.17}{{\,}^{\text{o}}}\text{C}\]

    C)  \[\text{0}\text{.117}{{\,}^{\text{o}}}\text{C}\]                

    D)  \[\text{1}\text{.43}{{\,}^{\text{o}}}\text{C}\]

    Correct Answer: C

    Solution :

                     \[\frac{mgh}{J}=ms\Delta t\]\[\Rightarrow \] \[\Delta t=\frac{gh}{Js}=\frac{9.8\times 50}{4.2\times {{10}^{3}}\times 1}=0.117{{\,}^{o}}C\]


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