mt1A - Astronomy 10 - Fall 2008 Midterm 1 October 7, 2008...

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Unformatted text preview: Astronomy 10 - Fall 2008 Midterm 1 October 7, 2008 This test has 40 multiple-choice questions. You need Scantron form 882-E to take it. You are allowed to use a calculator and one page (double-sided) of written notes. All other materials and references should be put away. Note the list of equations and physical quantities attached to the back of this test. Be sure to write your full name , SID , and section number on your Scantron form. 1. THIS EXAM IS VERSION A. PLEASE ANSWER A TO QUESTION 1. 2. A satellite is orbiting the Earth at an altitude of 100 km. Which figure most closely approxi- mates its orbital period? The mass of the Earth is 5 . 97 10 24 kg and its radius is 6380 km. (a) 10 seconds (b) 90 minutes (c) 24 hours (d) 90 hours 3. Two exoplanets orbit the same star. The innermost planet is observed to have a period of 4 days, while the outer one has a period of 32 days. If the inner planet has an orbital radius of 0.06 AU, what is the orbital radius of the outer one? (a) 0.12 AU (b) 0.24 AU (c) 0.36 AU (d) 0.48 AU 4. Xenon has a spectral line with a wavelength of 609.759 nm. What is the frequency of this line? (a) 4 . 917 10 14 Hz (b) 2 . 034 10 14 Hz (c) 4 . 916 10 13 Hz (d) 4 . 616 10 12 Hz 1 5. From laboratory measurements, we know that a particular spectral line of magnesium has a wavelength of 279.6 nm. The spectrum of a star shows the same magnesium line appearing at a wavelength of 279.4 nm. What can we conclude? (a) The star is getting hotter. (b) The star is getting colder. (c) The star is moving away from us. (d) The star is moving toward us. 6. Carbon-14 (ie, carbon with an atomic weight of 14) is a radioactive isotope that slowly decays into the stable isotope nitrogen-14. Carbon has an atomic number of 6, while that of nitrogen is 7. Which of the following quantities is conserved during the decay process, ie., which has the same value before and after? (a) The total number of protons in the atom. (b) The total number of electrons plus protons. (c) The total number of electrons. (d) The total number of neutrons plus protons. 7. You land on the planet Bizzaro, which has half the Earths mass but three times its radius. On Earth, you weigh 180 lb. On Bizzaro, you weigh (a) 10 lb (b) 60 lb (c) 90 lb (d) 180 lb 8. If you see the Sun rise exactly due East, then (a) you must be at the equator. (b) you must be either at the north or south pole. (c) it must be either the summer or winter solstice. (d) it must be either the autumnal or spring equinox. 2 9. Which of the following lists has objects in order of increasing distance from the Sun? (a) terrestrial planets, Kuiper belt, Jovian planets, asteroid belt, Oort cloud (b) terrestrial planets, Jovian planets, Kuiper belt, Oort cloud, asteroid belt (c) terrestrial planets, asteroid belt, Jovian planets, Kuiper belt, Oort cloud (d) Jovian planets, asteroid belt, terrestrial planets, Oort cloud, Kuiper belt 10. Which of the following statements is an accurate description of our solar system?10....
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mt1A - Astronomy 10 - Fall 2008 Midterm 1 October 7, 2008...

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