A solid metal weighing 150 g melts at its melting point of `800^(@)C` by providing heat at the rate of 100 W. The time taken for it to completely melt at the same temperature is 4 min. What is the specific latent heat of fusion of the metal ?

Explanation

Given, mass `m = 150 g = 0.15 kg, `power P = 100 W, time t = 4 min = `4 xx 60 = 240 s`
energy supplied Q = power `xx` time `= 100 xx 240 = 24000 J`
specific latent heat `L = (Q)/(m) = (24000)/(0.15 ) = 1.6 xx 10^5 J kg^(-1)`