ICSE Class 10 Physics 2018 Solved Paper

Question : 32 of 78

Marks: +1, -0

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?

Solution:

Given :

m=150 {\g}, {\P}=100 {\W}

, time

=4 {\min}

=4 × 60=240 {\ s}

Heat energy required to melt the metal = Electrical Energy supplied.
or

m {\L}\;= {\P} × t

{\L}\;=\;{ {\P} × t}/{m}=\;{100 × 240}/{150} {\J} \/ {\g}

\;=160 {\J} \/ {\g}

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