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PHYC 2452 Study Guide - Barred Spiral Galaxy, Spiral Galaxy, Quasar

Physics & Atmospheric Science
Course Code
PHYC 2452
David Langille

of 10
PHYSICS 2452 Name:_________________________ Thursday
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 10-11 m3 kg-1 s-2
Mass of proton, mP1.67 x 10-27 kg
Mass of the Sun, Mu2 x 1030 kg
Parsec, pc 206 000 A.U.
Stefan-Boltzmann constant, F5.67 x 10-8 W m-2 K-4
Hubble Constant, H073 km s-1 Mpc-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
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
A3) In which constellation does the centre of the Milky Way galaxy appear to lie?
a) Orion b) Ursa Major c) Sagittarius d) Lyra
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
A5) What was the temperature of the universe in the “Era of Recombination”?
a) 3 x 1010 K b) 3 000 K c) 3 K d) 3 x 105 K
A6) What fraction of the mass of a cluster of galaxies is comprised of Dark Matter?
a) 10% b) << 1% c) 90% d) Half
A7) The energy output of a bright quasar is equivalent to:
a) 1 000 Lub) 106 Luc) Milky Way d) 1000
A8) What would be the absolute magnitude of a galaxy containing 1010 stars like the
a) -20 b) -15 c) +5 d) +15
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) 10-43 s b) 1 s c) 3 min d) 3 x 105 yr
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
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