A slab of stone of area 0.36 m^2 and thickness 0.1 m is exposed on the lower surface to steam at 100°C. A block of ice at 0°C rests on the upper surface of the slab. In one hour 4.8 kg of ice is melted. The thermal conductivity of slab is :

 

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A slab of stone of area 0.36 m^2 and thickness

0.1 m is exposed on the lower surface to steam at 100°C. A

block of ice at 0°C 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 of fusion of ice = 3.36 × 10^5 J kg^–1.) :

(a) 1.24 J/m°C (b) 1.29 J/m°C

(c) 2.05 J/m°C (d) 1.02 J/m°C

Answer: a