• 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

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