In solar water heater, energy from sun is gathered by water that circulates through the tubes in a rooftop collector. The sun heated water is pumped to a water container. Assume the efficiency of the system to be 20%. What collector area is needed to raise the temperature of 200 litre of water in a tank from 20∘C to 40∘C in 1.0 hours when the intensity of the sunlight is 700 W/m^2?

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Wien's displacement law

Students often get confused between Wien's displacement law and Planck's radiation law. Although both are historically related, yet they are conceptually different. Planck's law helps determine the spectrum of a blackbody, while Wien's law determines the relationship between peak wavelength and temperature.