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if a photon from the cosmic microwave background had wavelength λ0 when it was emitted at...

if a photon from the cosmic microwave background had wavelength λ0 when it was emitted at redshift z, its wavelength today is λ= λ0 (1+z). (a) let T be the symbol for the temperature of the cosmic microwave background today. explain why the radiation temperature was T0= T(1+z) at redshift z (b) what was the radiation temperature at z= 1? (c) at what redshift was the radiation temperature equal to 293 K (a typical room temperature)

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