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.