If the cosmological microwave background was emitted by a plasma with a temperature temperature of 4000 K and is observed with a temperature of 2.73 K today, at what redshift was it emitted? (Assume Wien's law.) By what factor did the scale of the universe between these two epochs
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6. If the cosmological microwave background was emitted by a plasma with a temperature temperature of 4000 K and is observed with a temperature of 2.73 K today, at what redshift was it emitted? (Assume Wien's law.) By what factor did the scale of the universe between these two epochs?
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