Q. Three objects coloured black, gray and white can withstand hostile conditions upto . These objects are thrown into a furnace where each of them attains a temperature of . Which object will glow brightest?

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Solution:

An ideal black body absorbs all the radiations incident upon it and has an emissivity equal to 1 . If a black body and an identical another body are kept at the same temperature, then the black body will radiate maximum power. Hence, the black object at a temperature of will glow brightest.