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 `m = 150 = g - 0.15 kg.` Heat Rate `P = 100 W`
time t = 4 in `= 4 xx 60 s = 240 s.`
Let L is the latent heat of metal, we know that mL = `P.Delta t`
`to L = P. Delta t //m = 100 xx 4 xx 60//0.15 = 1. 6 xx 10 ^(5) J//kg`