Solve CMB Peak Wavelength & Quark Fates | Astronomy Problem Help

[paigecoal]

Hi, can anyone help me solve the following questions?

1.What was the peak wavelength of the CMB when R=0.5?
a. What temperature does this correspond to?

2. Two quarks named Susan and Nick existed in the early universe. Susan
became part of a proton and Nick became part of a neutron. What are
two potential fates for both Susan and Nick about an hour into the age of the
universe?

 

[MotoH]

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