Study Guides (380,000)
CA (150,000)
Dal (600)
PHYC (8)

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

Department
Physics & Atmospheric Science
Course Code
PHYC 2452
Professor
David Langille

Page:
of 10
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 10-11 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
/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 1010 K b) 3 000 K c) 3 K d) 3 x 105 K
/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 Lub) 106 Luc) Milky Way d) 1000
bright
A8) What would be the absolute magnitude of a galaxy containing 1010 stars 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) 10-43 s b) 1 s c) 3 min d) 3 x 105 yr
/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