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It takes 20 min to melt 10 g of ice, when rays from the sun are focussed by a lens of diameter 5 cm on a block of ice. If the latent heat for ice is 80 cal/g, the heat received per unit area per unit time at the surface of earth (in cal cm–2min–1) is |
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Answer» It takes 20 min to melt 10 g of ice, when rays from the sun are focussed by a lens of diameter 5 cm on a block of ice. If the latent heat for ice is 80 cal/g, the heat received per unit area per unit time at the surface of earth (in cal cm–2min–1) is |
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