Properties Of Solids And Liquids Question 447

Question: A slab of stone of area 0.36m2 and thickness 0.1 m is exposed on the lower surface to steam at100C . A block of ice at 0C rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is: (Given latent heat effusion of ice =3.36×105J

kg1 .):

Options:

A) 1.24J/mC

B) 1.29J/mC

C) 2.05J/mC

D) 1.02J/mC

Show Answer

Answer:

Correct Answer: A

Solution:

[a] dQdt=KA(1000)1=mdLdt,

K×100×0.360.1=4.8×3.36×10560×60

=1.24J/m/s/C



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