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Question

A polished metal plate with a rough black spot on it is heated to about 1400 K and quickly taken to a dark room. The spot will appear

A
darker than the plate surface
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B
brighter than the plate surface
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C
equally bright as the plate surface
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D
equally dark as the plate surface
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Solution

The correct option is B brighter than the plate surface
On heating, the black spot will absorb maximum radiation while the polished part reflects most of the radiation. Therefore, when the plate is taken to a dark room, the spot will emit more radiations than the rest of the plate surface. Hence, it will appear brighter than the plate surface.

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