Three hundred thousand years after the Big Bang, the average temperature of the universe was about 3000

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Three hundred thousand years after the Big Bang, the average temperature of the universe was about 3000 K.
a) At what wavelength would the blackbody spectrum peak for this temperature?
b) In what portion of the electromagnetic spectrum is this wavelength found?
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University Physics With Modern Physics

ISBN: 978-0073513881

2nd edition

Authors: Wolfgang Bauer, Gary Westfall

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