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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 B. PLEASE ANSWER B TO QUESTION 1. 2. When white light pases through a glass prism, it splits into many colors. Why? (a) Different wavelengths are Doppler-shifted by different amounts. (b) Photons with different frequencies repel each other. (c) Different wavelengths of light are refracted by different amounts. (d) Electrons in the glass have many colors. 3. A large, rotating gas cloud collapses due to self-gravity. What happens to its rotation speed as it collapses? (a) It increases. (b) It decreases. (c) It remains constant. (d) It first decreases, then increases. 4. Which statement below is true about the Earth, Sun, and Moon? (a) The existence of the Moons craters shows that it is made of softer material than the Earth. (b) The gravitational force of the Moon on the Earth equals that of the Earth on the Moon. (c) The gravitational force of the Moon on the Earth exceeds that of the Sun on the Earth. (d) An astronaut on the far side of the Moon never sees sunlight. 1 5. A dwarf planet orbits the Sun in a highly eccentric ellipse. The aphelion is 90 AU and the perihelion is 30 AU. If the velocity at aphelion is 2.2 km s- 1 , what is the perihelion velocity? (a) 2.2 km s- 1 (b) 4.4 km s- 1 (c) 6.6 km s- 1 (d) 8.8 km s- 1 6. Why do the innermost moons of planets tend to show the same face to that planet? (a) A consequence of the fact that the entire solar nebula rotated in the same direction. (b) A consequence of angular momentum conservation. (c) A chance coincidence. (d) A consequence of tidal forces acting on the moons. 7. Venus does not have seasons like Earth and Mars do. Why? (a) Its rotation axis is not tilted enough. (b) It does not rotate fast enough. (c) It is too close to the Sun. (d) Its atmosphere creates even stronger seasonal variations than on Earth or Mars. 8. A star has a surface temperature of 6273 K. At what wavelength do we observe the peak intensity? (a) 874.7 nm (b) 462.3 nm (c) 583.3 nm (d) 808.1 nm 9. 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?...
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