Question

What happens when you heat china having some dark paintings engraved on it at 1000°C and then examine it in a dark room immediately?

(a) The dark painting will appear much brighter

(b) The whole china dish will be bright

(c) The china dish doesn’t glow

(d) The china dish will develop patterns

Answer 1

The correct option is (a) The dark painting will appear much brighter

Best explanation: According to Kirchhoff’s law, if a body strongly absorbs radiation of a certain wavelength, it must emit strongly the radiation of the same wavelength. The dark paintings are better absorbers, and therefore, also better emitters.