astro final 1 - Exam 3 Phys 110 Spring 2006 1 The Drake...

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Exam 3 Phys 110 Spring 2006 1. The Drake equation attempts to determine: a. The conditions under which life originated on Earth b. The optimum wavelength for communicating with other advanced civilizations in the Milky Way c. The size of habitable zone around the Sun d. The number of other technically advanced civilizations in the Milky Way e. None of the above 2. Which part of the electromagnetic spectrum allows the most efficient searches for intelligent life in the Universe? 3. The Miller-Urey experiment demonstrated that: a. Very simple bacteria can be created from the chemicals present in the atmosphere of the early Earth. b. The Earth’s early atmosphere was too harsh for life to have formed until recently. c. Conditions on the early Earth were suitable for the creation of many of the complex organic molecules found in living organisms. d. If simple life forms landed on the early Earth, they could have survived. e. Early life forms were silicon-based. 4. Which pair of objects in the Solar System is of great interest to those searching for past and present forms of life?
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5. What happened when the Universe was about 300,000 – 400,000 years old? 6. When we say that the electroweak force and strong nuclear force “freeze out” at 10 -35 seconds after the Big Bang, we mean that: a. These forces are important only at temperatures below the freezing point of water – a temperature that the Universe reached at an age of about 10 -35 seconds. b. Prior to this time, the electroweak force and strong nuclear force maintained a single identity, but they possessed separate identities afterwards. c. Afterwards, neither strong nuclear force nor the electroweak force was ever important in the Universe again. d. Prior to this time, both strong nuclear force and the electroweak force were negligible compared to the quantum fluctuations of space time. e. Prior to this time, there were no forces in the Universe, not even gravity. 7. Why are current theories unable to describe the Universe during the Planck era? a. We do not yet have a theory that combines quantum mechanics and the theory of general relativity.
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