Q.
Three objects coloured black, gray and white can withstand hostile conditions upto 2800∘C. These objects are thrown into a furnace where each of them attains a temperature of 2000∘C. Which object will glow brightest?
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 2000∘C will glow brightest.