Question

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 $3.4\times {10}^{5}J/kg$ and $g=10N/kg]$:

• A. $34km$
• B. $544km$
• C. $136km$
• D. $68km$

Answer 1

The correct option is C $136km$

Given that: $mgH=mL$

$\Rightarrow H=\frac{4L}{g}=\frac{4\times 3.4\times {10}^5}{10}=136km$