A polished metal plate with a rough black spot on it is heated to about $1400 K$ and quickly taken into a dark room. Which one of the following statements will be true?

The spot will appear brighter than the plate

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The spot will appear darker than the plate

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The spot and the plate will appear equally bright

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The spot and the plate will not be visible in the dark room

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Solution

The correct option is D The spot will appear brighter than the plate
According to Kirchhoff law, good absorbers are good emitters. Since black spot is good absorbers so it is also a good emitter & will brighter than plate.

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A polished metal plate with a rough black spot on it is heated to about 1400K and quickly taken into a dark room. Which one of the following statements will be true?

The correct option is D The spot will appear brighter than the plateAccording to Kirchhoff law, good absorbers are good emitters. Since black spot is good absorbers so it is also a good emitter & will brighter than plate.

A polished metal plate with a rough black spot on it is heated to about $1400 K$ and quickly taken into a dark room. Which one of the following statements will be true?

The correct option is D The spot will appear brighter than the plate
According to Kirchhoff law, good absorbers are good emitters. Since black spot is good absorbers so it is also a good emitter & will brighter than plate.