AST201_Homework_2__AST201H1_S_LEC0101_20241_Stars_and_Galaxies (4)
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School
University of British Columbia *
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Course
201
Subject
Astronomy
Date
Apr 3, 2024
Type
Pages
6
Uploaded by CorporalFlagGuanaco38
1/28/24, 8:44 AM
AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies
https://q.utoronto.ca/courses/336471/quizzes/373183
1/6
AST201 Homework 2
Due
Feb 1 at 2p.m.
Points
9
Questions
9
Available
Jan 25 at 3p.m. - Apr 9 at 11:59p.m.
Time Limit
None
Allowed Attempts
3
Attempt History
Attempt
Time
Score
KEPT
Attempt 1
28 minutes
6.83 out of 9
LATEST
Attempt 2
24 minutes
6.17 out of 9
Attempt 1
28 minutes
6.83 out of 9
Correct answers will be available on Feb 1 at 2p.m..
Score for this attempt: 6.17
out of 9
Submitted Jan 28 at 8:43a.m.
This attempt took 24 minutes.
Take the Quiz Again
1 / 1 pts
Question 1
Which of the following would be true if the Sun were gently compressed to
form a black hole, without changing its mass?
Earth’s orbit would become elongated. The black hole would quickly suck in Earth. Earth would gradually spiral into the black hole. Earth would remain in the same orbit.
1/28/24, 8:44 AM
AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies
https://q.utoronto.ca/courses/336471/quizzes/373183
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The Sun’s event horizon would reach the present location of Mercury.
1 / 1 pts
Question 2
Which of the following statements about the fundamental forces is true?
Electrons are the carrier particles of the electromagnetic force. The strong nuclear force is responsible for holding electrons in orbit around
atomic nuclei.
The weak nuclear force is the weakest of the four fundamental forces. Photons are the carrier particles of the electromagnetic force. The strong nuclear force can act over an infinite range of distances. 1 / 1 pts
Question 3
Which of the following is a true statement about an event horizon?
Light can escape the event horizon, but matter cannot. Event horizons are theoretical boundaries that have no relationship with
reality.
The event horizon is the very centre of the black hole. The event horizon looks black because light cannot escape it. The radius of the event horizon is called the Hawking radius.
1/28/24, 8:44 AM
AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies
https://q.utoronto.ca/courses/336471/quizzes/373183
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0.5 / 1 pts
Question 4
Partial
Partial
Which of the following methods have been used to establish the existence
of black holes? Select all that apply.
Sending space telescopes to visit black holes and take pictures of them up
close.
Using global telescope networks to take images of supermassive black
holes.
Observing that there is a large amount of ‘missing mass’ in galaxy clusters
that can’t be seen with telescopes.
Observations of x-ray emissions from binary star systems. Measuring how the precession of the perihelion of Mercury is affected by
the supermassive black hole at the center of our galaxy.
1 / 1 pts
Question 5
Which of the following statements are true regarding black holes? Select
all that apply.
At their centers, small galaxies have stellar-mass black holes while large
galaxies have supermassive black holes.
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1/28/24, 8:44 AM
AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies
https://q.utoronto.ca/courses/336471/quizzes/373183
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Most large, spiral galaxies have supermassive black holes at their centers. Black holes are illusions, created by gravity bending light but they do not
actually exist.
Supermassive black holes have larger event horizons than stellar-mass
black holes
Some galaxies appear much smaller than others because their
supermassive black holes absorb most of the nearby visible matter.
0.67 / 1 pts
Question 6
Partial
Partial
Which of the following is an incorrect pairing of a fundamental force of
nature, and one of its attributes:
Gravity, Is the weakest fundamental force Weak nuclear force, Holds atomic nuclei together Strong nuclear force, Makes masses attract one another Strong nuclear force, Holds atomic nuclei together Strong nuclear force, Occurs only between electrically charged particles 0 / 1 pts
Question 7
Incorrect
Incorrect
1/28/24, 8:44 AM
AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies
https://q.utoronto.ca/courses/336471/quizzes/373183
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Mercury, the least massive and smallest planet in the Solar System, has a
radius of approximately 2,400 kilometers. Which of the following would be
true if Mercury was replaced with a black hole that has a Schwarzschild
radius of 2,400 kilometers?
The black hole would absorb all of the light in the Solar System. The black hole would orbit the Sun at the same distance as Mercury
currently does.
The black hole would have the same mass as Mercury. The orbits of the planets would be significantly affected. The orbits of the planets in the Solar System would be unaffected. 0 / 1 pts
Question 8
Incorrect
Incorrect
Which of the following lists correctly orders objects by decreasing escape
speed at their surface. Hint: no complex math is required for this
question.
1,000,000 solar mass, 4 solar radius black hole, 0.075 solar mass, 0.1
solar radius star, 1.4 solar mass,0.01 solar radius white dwarf, 1.4 solar
mass, 0.00002 solar radius neutron star
1.4 solar mass, 0.00002 solar radius neutron star, 60 solar mass, 12 solar
radius star, 1 solar mass, 1 solar radius star, 0.075 solar mass, 0.1 solar
radius star
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AST201 Homework 2: AST201H1 S LEC0101 20241:Stars and Galaxies
https://q.utoronto.ca/courses/336471/quizzes/373183
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1.4 solar mass, 0.00002 solar radius neutron star, 1.4 solar mass,0.01
solar radius white dwarf, 1,000,000 solar mass, 4 solar radius black hole,
0.075 solar mass, 0.1 solar radius star
1.4 solar mass,0.01 solar radius white dwarf, 1.4 solar mass, 0.00002 solar
radius neutron star, 1,000,000 solar mass, 4 solar radius black hole, 60
solar mass, 12 solar radius star
1.4 solar mass, 0.00002 solar radius neutron star, 1,000,000 solar mass, 4
solar radius black hole, 1 solar mass, 1 solar radius star, 60 solar mass, 12
solar radius star
1 / 1 pts
Question 9
Compared to a stellar mass black hole, a supermassive black hole
has:
a lower mass a larger Schwarzschild radius the ability to suck in our Sun a wider singularity a higher escape speed Quiz Score: 6.17
out of 9
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