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UW ASTR 101 - Exam Guide

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Name:Final Practice QuestionsThese are a few of the questions I did not chose to put on the final exam next week (8/20).They cover similar material and are written in the same style but the final exam questionsmay be more clear and may make greater use of figures. The exam will consist of 13 – 15questions covering material learned in lecture, in class activities, readings and/or labs andyou will have the entire class period to complete it in. You should make sure to explain youranswers and show your work. In some cases, it may be appropriate to draw a figure. Anyequation necessary other than for gravity and luminosity will be provided and you will beallowed to use a calculator.1. Astronomer Spika observes light from a very thick, dusty disk around a young star.• How did this disk form?• How is this disk related to planet formation?• By observing many such stars, Spika finds that disks formed around high-massstars last for less time. Why is this?2. Molecular clouds consist of cold gas and dust.• What force prevents this clouds from collapsing?• What force prevents them for dissipating (i.e. keeps the matter bound together)?• Imagine a hotter-than-average molecular cloud that is beginning the collapse toform a star. What can you say about the density of this cloud as compared toother molecular clouds?3. Rotation Curves of Galaxies• You measure the rotational velocities of stars in two different galaxies (galaxy Aand galaxy B). You notice that the velocities of stars located 10 thousand lightyears away from the center of each galaxy are the same. What does this implyabout the mass of each galaxy within a radii or 10 thousand light years?• You find that galaxy A is substantially brighter than galaxy B. What can you sayabout the relative amounts of dark matter in each?4. How does the average luminosity, metallicity, and color of stars in the halo compare tostars in the disk of the Milky Way? What does this imply about the formation of theMilky Way?5. Hubble originally called spiral galaxies ”Early-Type Galaxies” and elliptical galaxies”Late-Type Galaxies.” How is this a misnomer?Astronomy 101 0 – 1 Introduction to Astronomy6. You are observing a starburst galaxy.• What causes the intense amount of energy generated in this starburst galaxy?• In what wavelengths will you best be able to observe the energy emitted by thisgalaxy?7. Galaxy A is retreating from you at 56 km/s, Galaxy B is retreating from you at 145km/s, and Galaxy C is moving toward you at 11 km/s.• What are the relative positions of the three galaxies?• Why is Galaxy C moving toward you?8. Suppose it was found that an incorrect calculation of the luminosity of White Dwarfsupernovae meant that distances found using them were off by 15%• How would this effect our error for distances found using Main Sequence fitting?• How would this effect our error for distances found using redshifts?9. Using a picture, show how a donut-shaped Universe could appear flat. How does thisrelate to our understanding of the formation of our Universe?10. Suppose the initial amounts of matter and anti-matter had be equal. What sort ofuniverse would this have resulted in?11. The Drake Equation• Name one variable in the Drake Equation.• What value do you think that variable has?• How could we constrain the uncertainty of this variable?12. Astrometry uses very high resolution telescopes to detect changes in the positions ofstars?• What sort of planets is it easiest for Astrometry to detect?• What problem does this pose for detecting planets in the habitable zones of stars?Astronomy 101 0 – 2 Introduction to


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UW ASTR 101 - Exam Guide

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