Three objects coloured black, gray and w...

Three objects coloured black, gray and white can withstand hostile conditions upto `2800^(@)C`. These objects are thrown into a furance where each of them attains a temperature of `2000^(@)C`. Which object will glow brightest?

The white object

All glow with equal brigtness

Gray object

The black object

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The correct Answer is:

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.

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