An ideal black body at room temperature is thrown into a fu…

Physics Transmission of Heat Radiation (General, Kirchoff's Law, Black Body) MCQ (Single Correct)

An ideal black body at room temperature is thrown into a furnace. It is observed that

Initially it is the darkest body and at later times the brightest

It is the darkest body at all times

It cannot be distinguished at all times

Initially it is the darkest body and at later times it cannot be distinguished

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The correct answer is:

Initially black body absorbs all the radiant energy incident on it, So it is the darkest one. Black body radiates maximum energy if all other condition are same. So when the temperature of the black body becomes equal to the temperature of furnace it will be brightest of all.

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