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

Question

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 (A) in comparison with the plate, the spot will shine more (B) in camparison with the plate, the spot will appear more black (C) the spot and the plate will be equally bright (D) the plate and the black spot cannot be seen in the dark room

Tardigrade Admin · Accepted Answer

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.

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

in comparison with the plate, the spot will shine more

in camparison with the plate, the spot will appear more black

the spot and the plate will be equally bright

the plate and the black spot cannot be seen in the dark room

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.

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