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UW ASTR 101 - Exam Guide

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FinalAstronomy 101Winter 20061. The exam should take ∼2 hours to complete.2. There are 100 multiple choice questions.3. Choose the one alternative that best completes the statement or answers the question.4. If you leave the classroom during the exam, you cannot return!5. When you are done, please leave the room quietly!6. If you have a question, please raise your hand.7. Have a great vacation!!!!Astronomy 101 Final Winter 2006Pick the answer that best describes the approximate size of the followingobjects:1. The radius of the Milky WayA. 1 pc B. 10 kpc C. 1 Mpc2. The distance to the nearest starA. 1 pc B. 10 kpc C. 1 Mpc3. The distance to a galaxy that is receding from us with a speed of 7500 km/sA. B. 1 kpc C. 10 kpc D. 100 Mpc4. The mass of the Milky WayA. 1 M¯B. 10 M¯C. 106M¯D. 1012M¯5. The mass of a main sequence O-starA. 1 M¯B. 10 M¯C. 106M¯D. 1012M¯6. The rotation speed of the Milky WayA. 20 km/s B. 200 km/s C. 2000 km/s7. The interval between observations used to measure the parallax of nearby stars.A. 1 yr B. 106yr C. 1010yr8. The lifetime of an 0.1 M¯star.A. 1 yr B. 106yr C. 1010yr9. The wavelength of the light emitted by a laser pointerA. 5 nm B. 50 nm C. 500 nm D. 5000 nmPage 1 of 2010. The force of gravity is an inverse square law. This means that, if you double the distancebetween two massive objects, the gravitational force between themA. strengthens by a factor of 4.B. is unaffected.C. weakens by a factor of 4.D. also doubles.E. weakens by a factor of 2.11. The ultimate source of energy that powers the Sun isA. kinetic energy of the rotation of the Sun.B. chemical potential energy of hydrogen burning into helium.C. gravitational potential energy of the contraction of the gas cloud that formedthe Sun.D. mass energy of hydrogen fusing into helium.E. thermal energy of the high temperature hydrogen atoms in the Sun.12. Which of the following statements about electrons is not true?A. An electron has a negative electrical charge.B. Within an atom, an electron can have only particular energies.C. Electrons are never found outside of atomsD. Electrons can jump between energy levels in an atom only if they receive orgive up an amount of energy equal to the difference in energy between theenergy levels.E. Electrons have very little mass compared to protons or neutrons.13. Each of the following describes an ”Atom 1” and an ”Atom 2.” In which case are thetwo atoms different isotopes of the same element?A. Atom 1: nucleus with 8 protons and 8 neutrons, surrounded by 8 electrons.Atom 2: nucleus with 8 protons and 8 neutrons, surrounded by 7 electrons.B. Atom 1: nucleus with 4 protons and 5 neutrons, surrounded by 4 electrons.Atom 2: nucleus with 5 protons and 5 neutrons, surrounded by 4 electrons.C. Atom 1: nucleus with 7 protons and 8 neutrons, surrounded by 7 electrons.Atom 2: nucleus with 7 protons and 7 neutrons, surrounded by 7 electrons.D. Atom 1: nucleus with 6 protons and 8 neutrons, surrounded by 6 electrons.Atom 2: nucleus with 7 protons and 8 neutrons, surrounded by 7 electrons.Page 2 of 2014. When an atom loses an electron, it becomesA. a plasma.B. dissociated.C. an isotope.D. ionized.E. sublimated.15. From lowest energy to highest energy, which of the following correctly orders the differentcategories of electromagnetic radiation?A. radio, infrared, visible light, ultraviolet, X raysB. X rays, visible light, ultraviolet, infrared, radioC. infrared, visible light, ultraviolet, X rays, radioD. visible light, infrared, X rays, ultraviolet, radioE. radio, X rays, visible light, ultraviolet, infrared16. We can see each other in the classroom right now because weA. emit thermal radiation.B. emit visible light.C. reflect infrared light.D. emit infrared light.E. reflect visible light.17. Everything looks blue when viewed through a blue filter becauseA. the filter emits blue light and absorbs other colors.B. the filter transmits blue light and absorbs other colors.C. the filter reflects blue light and transmits other colors.D. the filter absorbs blue light and emits other colors.18. The spectrum of which of the following objects would not be shaped approximately likea thermal spectrum?A. a filament in a light bulbB. the hot, transparent gas surrounding a planetary nebulaC. a starD. you, in a dark roomPage 3 of 2019. When an electron in an atom goes from a higher energy state to a lower energy state,the atomA. can emit a photon of any frequency.B. absorbs several photons of a specific frequency.C. can absorb a photon of any frequency.D. emits a photon of a specific frequency.E. absorbs a photon of a specific frequency.20. Which of the following conditions leads you to see an absorption line spectrum from acloud of gas in interstellar space?A. The cloud is extremely hot.B. The cloud is cool and lies between you and a hot star.C. The cloud is cool and very dense, so that you cannot see any objects that liebehind it.D. The cloud is visible primarily because it reflects light from nearby stars.21. You detect an emission line spectrum from a cloud of gas. You know that which of thefollowing must be true:A. The gas is mostly ionized.B. There is a light source illuminating the gas.C. The gas is opaque.D. More than one of the above.E. None of the above.22. Suppose that Star X and Star Y both have redshifts, but Star X has a larger redshiftthan Star Y. What can you conclude?A. Star X is moving away from us faster than Star Y.B. Star Y is moving away from us faster than Star X.C. Star X is moving away from us and Star Y is moving toward us.D. Star X is coming toward us faster than Star Y.E. Star X is redder than Star Y.Page 4 of 2023. Suppose that you measure the parallax shift for Star A to be 0.5 arcsecond. Now supposeyou measure a parallax shift of 0.1 arcsecond for Star B. You can conclude that:A. Star A is 5 times closer than Star BB. Star A is 5 times farther than Star BC. You cannot tell the relative distance of the two stars without more information.24. If the distance between us and a star is doubled, with everything else remaining thesame, the luminosityA. is decreased by a factor of four, but the apparent brightness remains the same.B. remains the same, but the apparent brightness is decreased by a factor of four.C. remains the same, but the apparent brightness is decreased by a factor of two.D. is decreased by a factor of four, and the apparent brightness is decreased by afactor of four.E. is decreased by a factor of two, and the apparent brightness is


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