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Answer: Why does a good emitter of heat radiation appear

Chapter 16, Problem 40E

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QUESTION:

Problem 40E

Why does a good emitter of heat radiation appear black at room temperature?

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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.

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