JEE PHYSICS MCQ: THERMODYNAMICS

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Application +4 | -1

Earth receives

1400 \mathrm{~W} \mathrm{~m}^{-2}

of solar power. If all the solar energy falling on a lens of area

0.2 \, \mathrm{m}^{-2}

is focused on to a block of ice of mass

280 \, \mathrm{g},

then what is the time (in min) taken by the ice to melt completely?

[\mathrm{L}_{\text {fusion}}=3.3 \times 105 \mathrm{~J} \mathrm{~kg}^{-1}]

View answer and explanation

Correct option: A

5.5

Option A (5.5) is correct because the time taken to melt the ice is calculated by dividing the total heat required by the heat received per second.

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