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Black body radiation curves are universal. They depend only on the temperature and not on the size, shape of the material of the black body. The energy emitted per unit time versus wavelength of a black body is given by the figure shown.
A liquid cools from 65°C to 55°C in 5 mins. If the surrounding temperature is 35℃, calculate the time taken for temperature to fall from 45°C to 35°C.
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