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# Three objects coloured black, grey and white can withstand hostile conditions at $2800^{\circ}C$. These objects are thrown into a furnace where each of them attains a temperature of $2000^{\circ}C$. Which object will glow brightest?A. The white objectB. The black object.C. All glow with equal brightnessD. Grey object.

Last updated date: 13th Jun 2024
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Hint: We know that Kirchhoff's law of thermal radiation gives the relation of a material to the radiations emitted or absorbed, at any temperature. We can use this to find the individual relationships of the material and then compare them.

Here, clearly, none of the given bodies disintegrate at $2000^{\circ}C$. Then all the objects will absorb the heat but the black object will absorb maximum heat. Hence clearly black object will absorb all radiations and glow brightly due to its has high power of absorptivity and emissivity