The Conditions in the Early Universe at the Time Matter $\lambda$

question 35

Multiple Choice

The conditions in the early universe at the time matter became decoupled from radiation were (in terms of age t, peak background wavelength $\lambda$ , and equivalent temperature T)

• A) t = 2 * 10¹¹ years, \(\lambda\) = 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, \(\lambda\) = 0.3 \(\mu\)m, near UV, T = 10⁷ K
• D) t = 380,000 years, \(\lambda\) = 1 \(\mu\)m, infrared, T = 3000 K

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