MCQs for Homework Five - Astronomy II | ASTR 1020, Assignments of Astronomy

Download MCQs for Homework Five - Astronomy II | ASTR 1020 and more Assignments Astronomy in PDF only on Docsity! Astronomy II (ASTR-1020) — Homework 5 Due: 28 April 2009 The answers of this multiple choice homework are to be indicated on a Scantron sheet (either Form # 822 N-E or Ref # ABF-882) which you are to buy at the bookstore. Remember to use a No. 2 pencil on these Scantron sheets. Don’t forget to write your name and the Homework No. (e.g., 5) on the Scantron sheet. You are to turn in this Scantron at the beginning of class on the date indicated above. There are 20 questions on this homework assignment. Useful Constants G = 6.673 × 10−11 m3/s2/kg g = 9.80 m/s2 c = 3.00 × 105 km/s h = 6.626 × 10−34 J s k = 1.38 × 10−23 J/K H◦ = 50 km/sec/Mpc Mmoon = 7.35 × 1022 kg M = 1.99 × 1030 kg M⊕ = 5.98 × 1024 kg R⊕ = 6.38 × 106 m R = 6.96 × 108 m T = 5800 K 1 AU = 1.50 × 1011 m L = 3.90 × 1026 W e = 1.60 × 10−19 C σ = 5.67 × 10−8 W/m2/K4 me = 9.11 × 1031 kg mp = 1.67 × 10−27 kg 1 ly = 9.46 × 1015 m 1 pc = 3.09 × 1016 m 1 km = 103 m 1 hr = 3600 s 1 mi = 5280 ft 1 mi = 1.609 km 1 day = 24 hrs 1 yr = 365.24 days 1 Å = 10−10 m 1 nm = 10−9 m 1. Which of the following is considered a poor cluster? a) Virgo Cluster b) Hercules Cluster c) Local Group d) T Tauri Group e) Ursa Major Group 2. The fact that the rotation curve stays relatively flat beyond the position of the Sun whereas the number of stars falls off in this region tells us what about the Milky Way Galaxy? a) The Andromeda galaxy is going to collide with the Milky Way. b) The Milky Way is a member of the Local Group of galaxies. c) The mass of the Milky Way is 6 × 1011M . d) There is dark matter in the outskirts of the Galaxy. e) There are a lot of O star in the Milky Way’s halo 3. Which of the follow would be consider a type of active galaxy? a) spiral b) barred spiral c) elliptical d) lenticular e) quasar 4. Which of the following is used as a distance indicator for external galaxies? a) white dwarfs b) neutron stars c) Tully-Fisher relation d) Mira variables e) giant molecular clouds 5. What is the current temperature of the Universe? a) 98.5◦ F b) 0 K c) 100◦ C d) 2.7 K e) 5770 K 1