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Question

(B) According to Kirchhoff's law of radiation,good absorbers of radiation are also good emitters of radiation at a given temperature. Black spots are

Vedclass · Accepted Answer

Only the spots will shine.

Vedclass · Answer

(B) According to Kirchhoff's law of radiation,good absorbers of radiation are also good emitters of radiation at a given temperature. Black spots are good absorbers of heat radiation,so they will also be good emitters. When the vessel is heated to a high temperature and placed in a dark room,the black spots will emit more radiation compared to the polished or metallic surface of the vessel. Therefore,the black spots will appear to shine brightly,while the rest of the vessel will appear relatively dull or invisible.

If a vessel with black spots is heated to a very high temperature and then taken into a dark room,then:

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