p45_040.pdf

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Chapter 45 - 45.40
40. (a) For the universal microwave background, Wien’s law leads to
T = 2898 µ m
·
K
= 2 . 898 mm
·
K
=2 . 6K .
λ max
1 . 1mm
(b) At “decoupling” (when the universe became approximately “transparent”),
λ max = 2898 µ m
·
K
= 2898 µ m
·
K
=29nm .
T
10 5 K

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