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Use the Friedmann equation to a) determine the time, t, at which the of the universe...

Use the Friedmann equation to a) determine the time, t, at which the of the universe was 1x107 K, 2x108 K and 3x109 K. b) using information on the photodisintegration of deuterium, at what time were neutrons locked up in baryonic matter?

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