ICSE Class 10 Physics 2018 Solved Paper

Question : 32

Total: 78

A solid metal weighing 150g melts at its melting point of 800∘C by providing heat at the rate of 100W. 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?

Solution:

Given : m=150g,P=100W , time =4‌min =4×60=240 s
Heat energy required to melt the metal = Electrical Energy supplied.
or mL‌=P×t
or L‌=‌

P×t

=‌

100×240

150

J∕g
‌=160J∕g

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