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Physics & Atmospheric Science
PHYC 2452
David Langille

PHYSICS 2452 Name:_________________________ Thursday 2013-04-11 Astronomy II 19:00 - 22:00 D. A. Tindall Signature:_______________________ Dunn 117 Final Examination At the end of the examination hand in all pages of the booklet. Materials permitted: Calculator and two 8½"x 11" sheets of paper Gravitational constant, G 6.67 x 10 -11m 3kg-1-2 Mass of proton, m P 1.67 x 10 -27kg Mass of the Sun, M u 2 x 10 30 kg Parsec, pc 206 000 A.U. Stefan-Boltzmann constant, F 5.67 x 10 -8W m -K -4 Hubble Constant, H 0 73 km s-1Mpc -1 --------------------------------------------------- Section A: Multiple choice (25%) 10 questions worth 2 points each Circle the letter corresponding to the most appropriate answer to each A1) What is the length of time between one sunspot maximum and the next? a) 1 month b) 7 years c) 11 years d) 22 years /2 A2) A star has M=2.2 and m=5.2. How far away is it? a) 40 pc b) 0.6 pc c) 12.3 pc d) 130 pc /2 A3) In which constellation does the centre of the Milky Way galaxy appear to lie? a) Orion b) Ursa Major c) Sagittarius d) Lyra /2 A4) What is the ratio of barred spiral galaxies to ordinary spiral galaxies? a) 1:100 b) 10:1 c) 2:1 d) 1:2 /2 A5) What was the temperature of the universe in the “Era of Recombination”? a) 3 x 101K b) 3 000 K c) 3 K d) 3 x 105K /2 A6) What fraction of the mass of a cluster of galaxies is comprised of Dark Matter? a) 10% b) << 1% c) 90% d) Half /2 A7) The energy output of a bright quasar is equivalent to: a) 1 000 Lu b) 106Lu c) Milky Way d) 1000 bright A8) What would be the absolute magnitude of a galaxy containing 10 10stars like the Sun? a) -20 b) -15 c) +5 d) +15 /2 A9) What was COBE designed to measure? a) 21 cm line b) Hubble Constant c) Quasars d) Microwave background /2 A10) How long after the Big Bang did the universe become transparent? a) 10-4s b) 1 s c) 3 min d) 3 x 105yr /2 P ag e 1 of 6 /20 Section B (25%) 10 questions worth 2 points each Answer each question in the space provided What name describes each of the following? B1) The Sun’s outer atmosphere which has high temperature and low density _________________________ /2 B2) A low-mass star which is about the size of Earth _________________________ /2 B3) A powerful radio source at the centre of the Milky Way _________________________ /2 B4) A correlation between the width of the 21 cm line of spiral galaxies and their total luminosities _________________________ /2 B5) A method of grouping galaxies according to appearance _________________________ /2 B6) A disk of gas orbiting a star or black hole _________________________ /2 B7) Discoverers of the 3 K radiation – Nobel Laureates _________________________ /2 B8) A fundamental time defined by G, h and c, before which, it seems, we can know nothing. _________________________ /2 B9) The value of the density of the Universe which would make space flat. _________________________ /2 B10) The very first stars to form after the Big Bang – we have not yet directly observed any _________________________ /2 Page 2 of 6 /20 Section C (25%) Points for each part are shown beside its answer space Answer each question in the space provided C1) An RR Lyrae star is observed to be of magnitude +15. How far away is it? ______________ pc /5 C2) If you are measuring the 21 cm line in the plane of our Galaxy at angle of 45° from the galactic centre, you will see the largest Doppler shift from a gas cloud which is as far from the galactic centre as it is from the Sun. Explain this statement, using a diagram. /5 C3) In the spectrum of a galaxy, the calcium K line is observed at 403.2 nm. How far away is this galaxy? [The rest wavelength of the K-line is 393.3] ______________ Mpc /5 C4) How long can a virtual proton-antiproton pair exist, without violating mass/energy conservation? ________________ s /5 Page 3 of 6 /20 Section D (25%) 10 questions worth 2 points each Answer each question in the space provided In a few sentences, with a diagram if useful, explain what is meant by each of the following terms: D1) Supermassive Black Hole _________________________________________ __________________________________________________________________ _________________________________
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