WorksheetsAstro 1500 Final Exam Review 2: Lectures 15-26
Total questions: 24
Worksheet time: 14mins
Where and when is the final going to start?
Physics 3, Monday, December 16, 12 PM
Physics 3, Monday, December 16, 12 PM
Physics 3, Monday, December 16, 12 PM
Physics 3, Monday, December 16, 12 PM
Santa Claus's workshop, Sunday, February 31, Midnight
Which element will not produce net energy in stellar fusion?
Hydrogen
Oxygen
Sodium
Iron
Why are white dwarfs so hot?
White dwarfs fuse more hydrogen since they are more dense
White dwarfs fuse heavier elements since they are more dense
White dwarfs magnetic field amplifies the heat produced
Because they used to be a star's core
True or False: White Dwarfs and Neutron Stars produce energy through elemental fusion?
True
False
Follow up question: Regular Stars counteract gravitational collapse through force of elemental fusion. How do white dwarfs prevent gravitational collapse?
Neutron Degeneracy Pressure
Electron Degeneracy Pressure
Strong Nuclear Force
Magnetic Force
Which spectral type main-sequence star would live the longest?
O-Stars
B-Stars
K-Stars
M-Stars
True or False: Out of true stars, O-type stars have the weakest hydrogen lines
True
False
Which of the following about main-sequence stars is FALSE?
Main-sequence stars always fuse hydrogen
When a main-sequence star runs out of hydrogen, the core contracts and moves off the main-sequence
For main-sequence stars, bluer stars typically have the longest lifespan
For main-sequence stars, the hotter the temperature the more massive the star is
Why do younger stars typically live in the spiral arms of galaxies?
The rotation of the spiral arms produces newer stars
Galaxies acquire mass and grow in size, so younger stars form towards the outside
Younger stars are produced in the center but pushed out to the spiral arms
Younger stars need a lot of room in space to form
HI Clouds can be detected from...
21 cm radio line produced by spin-flip transitions
Electron Degeneracy Pressue
Space Telescopes
Interference of gamma rays
Suppose the radius of a black hole is doubled, what would that mean for the mass?
The mass would multiply by 2
The mass would multiply by 4
The mass would multiply by 1/2
The mass would multiply by 1/4
GRBs are produced from....
Neutron Stars merging
Collapsars/Hypernovas
Pulsars
Magnetars
Scientists can hypothesize what happens in a black hole by....
By uniting general relativity and quantum mechanics
Utilizing Mathematics
Experimental Data
Trick question, they can't
We have structures like the ones in the picture due to gravitational collapse, but the luminous mass we see doesn't seem to be enough to create these structures. How then could they form?
Extra gravitational force from dark matter
Primordial black holes started structure formation
There used to be more matter that has since been destroyed
We don't know
Which of these is NOT evidence of dark matter?
Galaxies in clusters seem to be moving fast enough to escape the cluster but they don't
Galaxy clusters don't seem to have enough luminous mass to contain their hot gas
We see evidence of gravitational lensing
The Milky Way's rotation curve is flat
Mercury's orbital precession
At the ACTUAL time of the cosmic microwave background, the radiation being released was in the ________ part of the spectrum
Microwave
Infrared
Visible
Ultraviolet
From lecture 24, we learned that when it was discovered that the Universe was expanding, Einstein conceded his notion. What was his notion?
That the Universe is collapsing
That the Universe is static
That the nature of the Universe is unknowable
That the Universe was vibrating
How did the CMB go from being infrared radiation when it first appeared to the microwave radiation we see today?
Dark energy distorted the CMB
The edge of the Universe cooled down
Cosmological redshift
Doppler redshift
What happened to the early Universe's quantum fluctuations that solidified upon inflation?
They became the seeds of superclusters
They became primordial black holes
They became the first globular clusters
They smoothed out
The Universe is infinite, so how come we can only see out to about 13.8 billion lightyears?
There's a "wall" there of radiation, formed before the Universe became transparent
The Universe is infinite, but nothing has formed at those distances yet
Dark energy blots out anything farther away than 13.8 billion light years
Anything beyond that point is receding faster than the speed of light
What are the correct percentages of ordinary matter (OM), dark matter (DM), and dark energy (DE)?
68% OM, 27% DE, 5% DM
68% DE, 27% DM, 5% OM
68% DM, 27% DE, 5% OM
68% DE, 27% OM, 5% DM
What makes the rings in these disks?
Orbital resonances
Aliens
The disks formed with those rings
Planets scooping up dust
What type of exoplanet tends to be easiest to detect with the transiting and radial velocity methods?
Small ones far from their host star
Small ones close to their host star
Large ones far from their host star
Large ones close to their host star
We're fairly certain about some factors in the Drake equation, but uncertain about others. Rank these in order of certainty, from least to most certain.
Sociological, astronomical, biological
Biological, sociological, astronomical
Sociological, biological, astronomical
Astronomical, biological, sociological
