A slab of stone of area \( 0.36 \mathrm{~m}^{2} \) and thickness \(...

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A slab of stone of area \( 0.36 \mathrm{~m}^{2} \) and thickness \( 0.1 \mathrm{~m} \) is exposed on the lower surface to steam at \( 100^{\circ} \mathrm{C} \). A block of ice at \( 0^{\circ} \mathrm{C} \)
P rests on the upper surface of the slab. In one hour \( 4.8 \mathrm{~kg} \)

W. of ice is melted. The thermal conductivity of slab is (Given latent heat of fusion of ice \( =3.36 \times 10^{5} \mathrm{~J} \mathrm{~kg}^{-1} \) ):
(2012 Mains)
(a) \( 1.24 \mathrm{~J} / \mathrm{m} / \mathrm{s} /{ }^{\circ} \mathrm{C} \)
(b) \( 1.29 \mathrm{~J} / \mathrm{m} / \mathrm{s} /{ }^{\circ} \mathrm{C} \)
(c) \( 2.05 \mathrm{~J} / \mathrm{m} / \mathrm{s} /{ }^{\circ} \mathrm{C} \)
(d) \( 1.02 \mathrm{~J} / \mathrm{m} / \mathrm{s} /{ }^{\circ} \mathrm{C} \)
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