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  4. There is a rough black spot on a polished metallic plate. If the plate is heated up to 1400 K (approximately) and then at once taken in a dark room, then

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Q. There is a rough black spot on a polished metallic plate. If the plate is heated up to $1400 \, K$ (approximately) and then at once taken in a dark room, then

NTA AbhyasNTA Abhyas 2022

Solution:

Good absorbers are good radiators and bad absorbers are bad radiators. The black spot on heating absorbs radiations and so emits them in the dark room while the polished shining part reflects radiation and absorbs nothing and so does not emit radiations and becomes invisible in the dark.