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Q.

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

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a

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

b

it is the darkest body at all times

c

it cannot be distinguished at all times

d

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

answer is A.

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Detailed Solution

Initially the black body at room temperature is darkest and when thrown in furnace, it absorbs heat till its temperature becomes equal to that of furnace. After this, it emits all the radiation of all wavelengths and appears bright.
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An ideal black-body at room temperature is thrown into a furnace. It is observed that