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JEE Main & Advanced Physics Thermometry, Calorimetry & Thermal Expansion Question Bank Self Evaluation Test - Thermal Properties of Matter

  • question_answer
    A piece of ice falls from a height h so that it melts completely. Only one-quarter of the heat produced is absorbed by the ice and all energy of ice gets converted into heat during its fall. The value of h is: [Latent heat of ice is \[3.4\times 1{{0}^{5}}\]J/kg and g=10N/kg]

    A) 34 km

    B) 544 km

    C) 136 km

    D) 68 km

    Correct Answer: C

    Solution :

    [c] According to question only one-quarter of the heat produced by falling piece of ice is absorbed in the melting of ice. i.e., \[\frac{mgh}{4}=mL\] \[\Rightarrow h=\frac{4L}{g}=\frac{4\times 3.4\times {{10}^{5}}}{10}=136km.\]


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