Earth receives 1400 W m -2 of solar power. If all the solar energy falling on a lens of area 0. 2 m -2 is focused on to a block of ice of mass 280 g, then what is the time (in min) taken by the ice to melt completely? [L fusion = 3.3x105 J kg -1 ]
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(5.5)
Heat required to melt the block
= (0.28kg) (3.3 x 10 5 J/kg) = 9. 24 x 10 4 J
Heat received per second = (1400J/m 2 ) (0. 2m 2 ) = 280 J
Time taken (in minutes) = 
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