Solution Found!
Why does a good emitter of heat radiation appear black at
Chapter 8, Problem 40E(choose chapter or problem)
Why does a good ?emitter? of heat radiation appear black at room temperature?
Questions & Answers
QUESTION:
Why does a good ?emitter? of heat radiation appear black at room temperature?
ANSWER:Solution 40E Step 1 of 2 : The materials which are good at emitting their thermal radiation are also good at absorbing incoming radiation. A good absorber appears black because radiation that impinges upon it is absorbed completely; The blackness of materials is evidence for their complete absorption. A good emitter appears black at room temperatures, because the thermal radiation it is emitting is too low in frequency to be seen. As good absorber appears black and since a good absorber is also a good emitter, it follows that a good emitter appears black.