AS12FI.docx

10 Pages
79 Views
Unlock Document

Department
Physics & Atmospheric Science
Course
PHYC 2452
Professor
David Langille
Semester
Winter

Description
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 _________________________________________ __________________________________________________________________ _________________________________
More Less

Related notes for PHYC 2452

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit