Question: Use Wien's law (see Problem 37) to answer the following questions: (a) The cosmic background radiation peaks in intensity at a wavelength of 1.1 mm.

Use Wien's law (see Problem 37) to answer the following questions:
(a) The cosmic background radiation peaks in intensity at a wavelength of 1.1 mm. 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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a We substitute l 2898 m m KT into the expression E hc l 1240 eV nm l ... View full answer

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