ASTR 1020 FINAL ACTUAL EXAM COMPLETE ALL 150 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS) | GRADED A+ | LATEST 2024/2025
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ASTR 1020
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ASTR 1020
ASTR 1020 FINAL ACTUAL EXAM COMPLETE
ALL 150 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) | GRADED A+ | LATEST
2024/2025
A main-sequence star of 3 solar masses has a radius of approximately 2.5 times the
radius of our Sun. According to Newton's formula, what would happen to the
grav...
ASTR 1020 FINAL ACTUAL EXAM COMPLETE
ALL 150 QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) | GRADED A+ | LATEST
2024/2025
A main-sequence star of 3 solar masses has a radius of approximately 2.5 times the
radius of our Sun. According to Newton's formula, what would happen to the
gravitational force felt by an object on the surface of this 3-solar-mass star if the
star's entire mass gradually collapsed to a singularity? Assume the object remains
on the surface of the star throughout the collapse. - ANSWER-The gravitational
force on the object would gradually increase toward infinity
According to Newton, the gravitational force on a photon should be - ANSWER-
zero
Say that your friend is standing on Earth, which is warping spacetime. He flashes a
pulse of light into space once every second (frequency of 1 pulse per second). You
are in a spaceship far from Earth, watching these pulses and recording how much
time passes between each. Given the effects of time dilation described here, how
will the frequency of the pulses from your perspective compare to the frequency
seen by your friend, who is standing with the light source? - ANSWER-You will
see a lower-frequency pulse
Given what you know of light, how does this change the apparent color of a light
source in a strong gravitational field from the perspective of an observer in a
weaker gravitational field? - ANSWER-Its color will appear redder to the observer
than it originally was
if you were a safe distance away from a black hole watching a person falling into
the black hole, how would the person appear to change as he fell deeper into the
,black hole? - ANSWER-The person would get redder in color, and the person's
heart rate would slow with time
What effects will the efficient fusion and high core temperatures have on high-
mass stars? - ANSWER-They will burn through their hydrogen more quickly,
owing to both the efficiency of the CNO cycle and the higher core temperature
What would allow the temperature of the Sun's core to rise enough for carbon
fusion to be possible? - ANSWER-Add mass to the sun
How will a more evolved high-mass star differ from when it was on the main
sequence? - ANSWER-The star will change spectral type, the star will become
larger in diameter, and the star will become redder in color
As the core collapses, the neutrons hit this limit in density, and a new, extremely
strong outward pressure called neutron degeneracy pressure appears. What effect
might this have on the material outside the neutron degenerate core, which was
previously collapsing under gravity? - ANSWER-It will expand outward
What elements are produced only in supernova explosions? - ANSWER-Copper,
gold, and silver
Owing purely to the effects of the gravitational force between individual galaxies,
which of the following should be true? - ANSWER-Some galaxies should be
moving towards the Milky Way, and others should be moving away from it.
Based on what you have learned in previous chapters, which of the following
measurements would we use to determine which galaxies are moving toward or
away from the Milky Way? - ANSWER-The Doppler Shift of spectral lines within
the galaxies spectrum.
, Given that elliptical galaxies are relatively round, ranging in shape from spheres to
more squished spheroids similar to an American football, which of the following
statements most accurately describes the orbits of stars in an elliptical galaxy? -
ANSWER-The stars all have irregular orbits in all directions around the center
On the basis of the colors and lifetimes of different types of stars, which of the
following statements best describes the current state of the bulge and disk? -
ANSWER-New stars are forming mostly in the disk.
choose the statement that best describes why there is more star formation in the
disk. - ANSWER-There is more cold, dense gas in the disk than in the bulge
which of the following most accurately describes the spiral arms? - ANSWER-The
stars move in and out of the arms while they rotate around the galaxy center.
What effect would you expect this (spiral arms) to have on stars? - ANSWER-
There will be more star formation inside the spiral arms
Think about what you have learned about stars and galaxies so far, and determine
which of the following statements is correct.
Choose one:
A. Both red and blue stars form inside the spiral arms. Then the red stars move out
of the arms, while the blue stars stay inside them.
B. Both red and blue stars form everywhere equally within the disk of the galaxy,
then something happens to clear the blue stars out from in between the arms.
C. Both red and blue stars form inside the spiral arms. Then both stars begin to
move out of the arms, but the blue stars die before they can get very far.
D. Red stars form in between the spiral arms, whereas blue stars form inside them.
- ANSWER-C
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