HumanitiesHistoryEconomic HistoryQuiz 12 example #10284
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Quiz 12

Cora Phillips avatar Cora Phillips
24 July 2022
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GUT (grand unified theory) refers to theories that
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unify the strong force and the electromagnetic and weak forces
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Why might inflation have occurred at the end of the GUT era
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An enormous amount of energy was released when the strong force froze out from the GUT
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Approximately how long did the era of nucleosynthesis last
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5 minutes
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What kinds of atomic nuclei formed during the era of nucleosynthesis
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hydrogen and helium and trace amounts of deuterium and lithium
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Why is the era of nucleosynthesis so important in determining the chemical composition of the universe
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Except for the small amount of matter produced later by stars, the chemical composition of the universe is the same now as the end of the era of nucleosynthesis
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Why did the era of nuclei end when the universe was about 300,000 years old
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The universe has expanded and cooled to a temperature of about 3,000 K, cool enough for stable, neutral atoms to form
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Where do the photons in the cosmic background radiation originate
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the end of the era of nuclei
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Olbers paradox is an apparently simple question, but its resolution suggests that the universe is finite age. What is the question
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Why is the sky dark at night?
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(From a science quiz that appeared in the weekly magazine The Economist) Economic history is easier to write than the history of the universe. Nevertheless, most cosmologists now think that when the universe was formed
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first there was a Big Band, then inflation (of space) caused recession (of all matter, away from the Big Bang)
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What happened to the quarks that existed freely during the particle era
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They combined in groups to make protons, neutrons and their antiparticles
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To date, physicist have investigated the behavior of matter and energy at temperatures as high as those that existed in the universe as far backs as ____ after the Big Band
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10 -10 second
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Why can't current theories describe what happened during the Planck era
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We do not yet have a theory that kins quantum mechanics and vernal relativity
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What direct evidence do we have that the weak and electromagnetic forces were once unified as a single electro weak force
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Particle accelerators on Earth can reach energies equivalent to the high temperatures of this era and have produced particles predicted by the electroweak theory
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Evidence that the cosmic background radiation really is the remnant of a Big Bang comes from predicting characteristics of remnant radiation from the Big Band and comparing these predictions with observations. Four of the Five statements below are real. Which one is fiction?
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The cosmic background radiation is expected to contain spectral lines of hydrogen and helium and it does
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Why does the Big Bang theory predict that the cosmic background radiation should have a perfect thermal radiation spectrum
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The background radiation came from the heat of the universe, with a peak corresponding to the temperature of the universe
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What are the two key observational facts that led to widespread acceptance of the Big Bang model
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the cosmic background radiation and the high helium content of the universe
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Why doe we expect the cosmic background radiation to be almost, but not quite, the same in all directions
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The overall structure of the universe is very uniform, but the universe must have contained some regions of higher density in order for galaxies to form