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A bucket full of hot water cools from 75ºC and 70ºC in time T1, 70º to 65ºC in time T2 and from 65ºC to 60ºC in time T3, then
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Important Questions on Heat Transfer
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Four indentical calorimeters painted in different colours, are heated to same temperature and then allowed to cool in vacuum. Which will cool fastest ?
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A body cools from 60ºC to 50ºC in 10 minutes, If the room temperature is 25°C and assuming Newtons' cooing law holds good, the temperature of the body at the end or next 10 minutes is :
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Compare to a person with white skin, another person with dark skin will experience:
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We consider the radiation emitted by the human body. Which of the following statements is true?
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Shown below are the black body radiation curves at temperatures T1 and T2 (T2 > T1). Which of the following plots is correct :-
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The radii of two spheres made of same metal are r and 2r. These are heated to the same temperature and placed in the same surrounding. The ratio of rates of decrease of their temperature will be
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If E is the total energy emitted by a body at a temperature TK and is the maximum spectral energy emitted by it at the same temperature, then-
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If be the emissive power and absorption power respectively of a body and be the emissive power of an ideal black body, then from Kirchhoff's laws
