A piece of ice falls from a hight 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 `3.4xx10^(5) j//kg` and `g=10N//kg`)

Options

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

Answer

C

Explanation

According to question only one-quarter of the heat produced by falling piece of ice is absorbed in the melting of ice.
i.e., `("mgh")/(4)=mL rArr h=(4L)/(g)=(4xx3.4xx10^(5))/(10)=136km`.