Explain how the events that occurred in the early universe are related to the forces that operate in the universe today. Multiple Choice: 43, 45, 51, 52, 57, 58, 59, 60, 62, 63, 67, 68 Short Answer: 22, 23, 25, 26 Illustrate the processes of pair production and annihilation. Multiple Choice: 41, 42, 55, 56 Short Answer: 27 22.5 String Theory and Multiverses Describe the motivation for string theory. Short Answer: 29, 30 Assess whether string theory is a scientific theory. Multiple Choice: 69, 70 Short Answer: 28 Assess whether multiverses are a scientific theory. Multiple Choice: 71 Working It Out 22.1 Calculate the critical density of the Universe. Multiple Choice: 4, 5 Short Answer: 3 Working It Out 22.2 Calculate the temperature and energy above which pair production of different particles can occur. Multiple Choice: 33 Short Answer: 13, 14
MULTIPLE CHOICE 1. If there were no dark energy in the universe, the value of __________ would solely determine the evolution and fate of the universe. a. H0 b. 1/H0 c. G d. Ωm e. ΩΛ 2. If Ωm = 0.5 today and there were no dark energy, the universe would a. expand forever.
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