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Question

The two opposite faces of a cubical piece of iron (thermal conductivity = 0.2 CGS units) are at 100 C and 0 C in ice. If the area of a surface is 4cm2 , then the mass of ice melted in 10 minutes will be

A
30 gm
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B
300 gm
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C
5 gm
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D
50 gm
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Solution

The correct option is B 300 gm
Q=mL=KA(θ1θ2)ltm=1L×KA(θ1θ2)l×t
=180×0.2×4×(1000)4×10×60 (l2=4l=4)
=0.2×4×100×60080×2=300 gm

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