Solution Found!
Answer: Why does a good emitter of heat radiation appear
Chapter 16, Problem 40E(choose chapter or problem)
QUESTION:
Problem 40E
Why does a good emitter of heat radiation appear black at room temperature?
Questions & Answers
QUESTION:
Problem 40E
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.