FUNDAMENTALS OF PHYSICS,AP ED.
FUNDAMENTALS OF PHYSICS,AP ED.
11th Edition
ISBN: 9781119472780
Author: Halliday
Publisher: WILEY
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Chapter 44, Problem 38P

Use Wien’s law (see Problem 37) to answer the following questions: (a) The cosmic background radiation peaks in intensity at a wavelength of 1.1mm. To what temperature does this correspond? (b) About 379 000 y after the big bang, the universe became transparent to electromagnetic radiation. Its temperature then was 2970 K. What was the wavelength at which the background radiation was then most intense?

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