NEET Physics Thermometry, Calorimetry & Thermal Expansion NEET PYQ-Thermometry, Calorimetry and Thermal Expansion

  • 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 :                                  [NEET - 2016]
    [Latent heat of ice is \[3.4\text{ }\times \text{ }{{10}^{5}}\text{ }J/kg\] anz\[g=10\text{ }N/kg\]]

    A)  34 km

    B)       544 km

    C)  136 km            

    D)       68 km

    Correct Answer: D

    Solution :

    [d] \[\frac{mgh}{4}=mL\]
                \[\Rightarrow \]   \[h=\frac{4L}{g}=\frac{4\times 3.4\times {{10}^{5}}}{10}=136\,km\].

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