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Determine at which redshift z this recombination occurred in the early universe. For simplicity, assume the universe was pure hydrogen (no helium or metal nuclei)

Determine at which redshift z this recombination occurred in the early universe. For simplicity, assume the universe was pure hydrogen (no helium or metal nuclei) at that time. The average baryon density today is n0 = 2 × 10-7 /cm3, the temperature of the microwave background is T0= 2.73 K.

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