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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Calorimetry

  • question_answer
    The height of a waterfall is 84 metre. Assuming that the entire kinetic energy of falling water is converted into heat, the rise in temperature of the water will be \[(g=9.8\,m/{{s}^{2}},\ J=4.2\,joule/cal)\]                                            [MP PET 1994]

    A)            0.196°C                                   

    B)            1.960°C

    C)            0.96°C                                     

    D)            0.0196°C

    Correct Answer: A

    Solution :

                       \[W=JQ\] Þ \[mg\,h=J(m.c.\Delta \theta )\]            Þ \[\Delta \theta =\frac{g\,h}{Jc}=0.0023\,h=0.0023\times 84=0.196{}^\circ C\]


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