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

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] \[\frac{mgh}{4}=mL\]

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