Spring 2012 ASTR 2030 Homepage
This
Final review sheet
is posted at
http://jila.colorado.edu/~ajsh/courses/astr2030_12/review_final.html
The
Special Relativity midterm review sheet
is posted at
http://jila.colorado.edu/~ajsh/courses/astr2030_12/review_sr.html
and the
General Relativity midterm review sheet
at
http://jila.colorado.edu/~ajsh/courses/astr2030_12/review_gr.html
Spring 2012 ASTR 2030 Final Review
The final will be at 7:30-10pm on Saturday May 5,
in our usual classroom Duane G1B20.
The final will test everything cumulatively over the semester.
Check out the
weekly summaries,
and the
clicker questions.
The format will be similar to that of the midterms, only longer.
The questions will be mostly multiple choice,
graded by scantron (which speeds grading),
but there will also be a few short answer questions.
Review Questions
-
How to Script a Movie.
Describe the
3 parts of a well-structured movie script.
-
Escape Velocity.
During this course
we have come across several examples where
we have been able to deduce things from
the equation
v = (2 G M / r)1/2.
What do the symbols in this equation signify?
Give several examples of where we have applied this equation.
In each case, was the equation applied exactly,
or just as an order of magnitude estimate?
-
Cold Matter.
Why is a liquid or solid almost "incompressible"?
At high enough pressure, a liquid or solid can be compressed;
what is the condition for this to occur?
What happens then?
Give an account of what happens to a sphere of cold matter
as you increase its mass.
Follow the stages through planet, white dwarf,
neutron star, black hole.
-
White Dwarfs.
What is a white dwarf?
What kind of pressure supports a white dwarf?
Give an account of this pressure.
Can particles at zero temperature move?
Can matter at zero temperature have a nonzero pressure?
-
Chandrasekhar Limit.
What is the Chandrasekhar Limit?
What causes it?
What happens if a white dwarf exceeds the Chandrasekhar limit?
-
Neutron Stars.
What is a neutron star?
What kind of pressure supports a neutron star?
Why are neutrons able to withstand a higher pressure than electrons?
-
Core Collapse Supernovae.
What is a core-collapse supernova?
Give an account of the evolution of a massive star
just before core collapse.
What is the core made of just before core collapse? Why?
What has the Chandrasekhar limit got to do with core collapse?
How does the core convert into being made of neutrons?
Does a core collapse supernova produce a neutron star or black hole?
What is the energy source of a core collapse supernova?
-
Pulsar.
What is a pulsar?
Who discovered pulsars?
The Crab nebula is thought to be the remnant of the Supernova of 1054.
How does the Crab nebula support Zwicky's idea
that supernovae result from the collapse of the core of a massive star
to a neutron star?
-
Thermonuclear Supernovae.
What is a thermonuclear supernova?
What has the Chandrasekhar limit got to do with it?
Give an account of the explosion.
What produces the observed luminosity of a thermonuclear supernova?
What is the energy source of a thermonuclear supernova?
-
Gravitational Waves.
What is a gravitational wave?
What kind of system produces gravitational waves?
Have astronomers seen gravitational waves?
Are astronomers likely to see gravitational waves at some time in the future?
-
Black Holes and the 2nd Law of Thermodynamics.
The 2nd law of thermodynamics asserts that “entropy always increases” in time.
What is entropy?
Black holes seem to violate the second law,
because they appear to destroy entropy when they swallow matter.
How did Hawking's work resolve the problem?
According to Hawking, what is the entropy of a black hole?
-
Hawking Radiation.
What is Hawking radiation?
Give a rough explanation of how it is produced.
What kind of spectrum does it have?
The most important thing to know about Hawking radiation is that
the characteristic wavelength is roughly equal to the Schwarzschild radius.
What does this imply about the Hawking temperature of Hawking radiation?
What would a black hole look like if detected in Hawking radiation?
Is Hawking radiation from real astronomical black holes observed
or observable?
Classically, an object that falls into a black hole appears to an
outside observer to become extremely redshifted and frozen at the horizon.
How does the presence of Hawking radiation modify this picture?
-
Black Hole Evaporation.
Black holes lose mass by Hawking radiation,
and can eventually evaporate.
For what kind of black hole is evaporation important?
Do such black holes exist?
Could such black holes exist?
Roughly how much energy does an evaporating black hole
produce when it explodes?
Spring 2012 ASTR 2030 Homepage
Updated 2012 Apr 25