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doit_the_clown doit_the_clown
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7 years ago
The conditions in the early universe at the time that matter became decoupled from radiation were (in terms of age t, peak background wavelength , and equivalent temperature T)
A)   t = 2 × 1011 years,      = 1 mm, microwaves,      T = 3 K
B)   The universe was never radiation-dominated since matter has always dominated by generating the gravitational field into which the universe has expanded.
C)   t = 3 minutes,      = 0.3 m, near UV,     T = 107 K
D)   t = 500,000 years,      = 1 m, infrared,     T = 3000 K
Textbook 
Discovering the Universe

Discovering the Universe


Edition: 7th
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Only two things are infinite, the universe and human stupidity, and I'm not sure about the former.

Albert Einstein
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hyponoticahyponotica
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7 years ago
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doit_the_clown Author
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7 years ago
Brilliant ツ
jblazah
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Yesterday
Smart ... Thanks!
ofsuahasiufhoas
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2 hours ago
I appreciate what you did here, answered it right Smiling Face with Open Mouth
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