Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 30 - Think and Explain: 72

Answer

Human eyes are not sensitive to infrared radiation.

Work Step by Step

At room temperature, objects radiate mostly in the infrared portion of the electromagnetic spectrum. In an otherwise dark room, such objects are invisible to the naked eye, because our eyes are not sensitive to IR radiation.
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