There is a rough black spot on a polished met | vedclass

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(A) According to Kirchhoff's law of radiation,good absorbers of radiation are also good emitters of radiation at a given temperature.$1$. The rough bl

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In comparison with the plate,the spot will shine more.

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(A) According to Kirchhoff's law of radiation,good absorbers of radiation are also good emitters of radiation at a given temperature.$1$. The rough black spot is a good absorber of radiation,and therefore,it is also a good emitter of radiation.$2$. The polished metallic plate is a poor absorber of radiation,and therefore,it is a poor emitter of radiation.$3$. When the plate is heated to $1400 K$ and taken into a dark room,the black spot emits a significant amount of thermal radiation,making it appear bright.$4$. The polished surface emits very little radiation,making it appear dark in comparison to the spot.Therefore,the spot will shine more than the plate.

There is a rough black spot on a polished metallic plate. It is heated up to $1400 K$ approximately and then at once taken into a dark room. Which of the following statements is true?

Similar Questions

Which of the following statements is wrong?

$Assertion :$ $A$ body that is a good radiator is also a good absorber of radiation at a given wavelength.
$Reason :$ According to Kirchhoff's law,the absorptivity of a body is equal to its emissivity at a given wavelength.

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What is a perfect black body? Give examples.

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