All In One Science

Book: All In One Science

Chapter: 14. Source of Energy

Subject: Physics - Class 10th

Q. No. 2 of Challengers

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100 W/m2 of solar energy is received by the Earth. If all the energy was to be absorbed by a bucket of water (mass 30 kg) in 30 minutes, then the rise in temperature of water will be


Power = 100 W/m2

Mass of water = 30 kg

Time = 30 minutes

Specific Heat of Water = 4200 J/kg °C


Heat Generated = Mass × Specific Heat × Temperature Rise.

Heat Generated = Power × time

Mass × Specific Heat × Temperature Rise = Power × time

Temperature Rise = 1.43 °C

So correct answer is C.

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