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Earth receives 1400 W//m^2 of solar powe...

Earth receives `1400 W//m^2` of solar power. If all the solar energy falling on a lens of area `0.2m^2` is focused on to a block of ice of mass 280 grams, the time taken to melt the ice will be….. Minutes. (Latent heat of fusion of ice=`3.3xx10^5J//kg)`

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`5.5`
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