Q 1(a)
Suppose that all of the matter in the universe were converted into energy in the form
of blackbody radiation. Take the average density of matter to be $\rho_{b,0} = 4.17 \times 10^{-28} kg/m^3$
Find the temperature of the Universe in this situation. Using Wien's law
($\lambda_{max} T = 0.0029 mK$) find at what wavelength would the blackbody spectrum peak.
Explain how your result may be applied to Olber's paradox.