ASTR Chapter 3
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University of Illinois, Urbana Champaign *
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Course
330
Subject
Astronomy
Date
May 7, 2024
Type
Pages
9
Uploaded by StanleyHazel
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Chapter 3 HW: Attempt review | Moodle-in-Canvas
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Marks
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Question 1
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Question 2
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Select one:
Stars are formed
a.
Throughout the Milky Way Galaxy
b.
In giant molecular clouds
!
Yes, where gravity coalesced enough material to collapse into a new star.
c.
In isolated regions away from other stars
d.
In large, diffuse clouds
e.
In the Big Bang
Your answer is correct.
The correct answer is: In giant molecular clouds
Select one:
Which stage is NOT
part of the Sun’s life
?
a.
Supernova explosion
!
Correct, the Sun will NEVER be a supernova. That is only for much more massive stars.
b.
Main sequence star
c.
Planetary nebula
d.
White dwarf
e.
Red Giant
Your+answer+is+correct.
The correct answer is: Supernova explosion
5/5/24, 11
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Chapter 3 HW: Attempt review | Moodle-in-Canvas
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Question 3
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Question 4
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Select one:
What keeps the Sun from collapsing
?
a.
Magnetic field
b.
Temperature
c.
Solid Core
d.
Turbulence
e.
Pressure
!
Yes, pressure from heat, which in turn is caused by fusion.
Your+answer+is+correct.
The correct answer is: Pressure
Select one:
Which one of the following is inarguably necessary for stars to form out of gas clouds
?
a.
Magnetic field
b.
Turbulence
c.
Gravity
!
Yes, you have to have gravity.
d.
Heavy elements.
e.
All of the above.
Your+answer+is+correct.
The correct answer is: Gravity
5/5/24, 11
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Chapter 3 HW: Attempt review | Moodle-in-Canvas
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Question 5
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Question 6
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Select one or more:
Which objects may be produced by a supernova explosion
?
(Hint: Could be more than one.)
a.
White dwarfs
b.
Supergiants
c.
Brown dwarfs
d.
Neutron stars
!
Yes, neutron stars are one possibility, but there is another.
e.
Black holes
!
Yes, black holes are one possibility, but there is another.
Your+answer+is+correct.
The correct answers are: Black holes, Neutron stars
Select one:
What does the phrase "We are star stuff" mean
?
a.
That we are evolved from life forms left on earth by ancient aliens
b.
That the elements that make up our body, other than hydrogen, were produced in the cores of
stars
!
We are star
stuff.
c.
That we go to the University of Illinois
d.
That we are dependent on the energy from the Sun for our existence
e.
That we are all special
Your answer is correct.
The correct answer is: That the elements that make up our body, other than hydrogen, were produced in the cores of stars
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Chapter 3 HW: Attempt review | Moodle-in-Canvas
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Question 7
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Question 8
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Select one:
Which of the following stars is the hottest
?
a.
The Sun
b.
A red star
c.
A blue star
!
Yes, blue stars are the hottest.
d.
A yellow star
e.
An orange star
Your+answer+is+correct.
The correct answer is: A blue star
Select one:
What is the last element to form by fusing in the core of a massive star before it goes supernovae
?
a.
Al
b.
Au
c.
Fe
!
Yes, after iron one needs to take energy to create heavier elements not making energy.
d.
He
e.
H
Your answer is correct.
The correct answer is: Fe
5/5/24, 11
:
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Chapter 3 HW: Attempt review | Moodle-in-Canvas
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Question 9
Correct
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Question 10
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Select one:
What subatomic particle was detected that confirmed nuclear fusion as the source of the Sun's luminosity
?
a.
Positron
b.
Gamma-rays
c.
Neutrino
!
Yes, one needs fusion for that to emerge from the Sun.
d.
Helium
e.
Deuterium
Your answer is correct.
The correct answer is: Neutrino
Select one:
The nuclear fusion in the Sun takes 4 hydrogen nuclei (4 positive charges) and makes 1 helium nucleus (2 positive charges). What
holds the nucleons in helium nucleus together
?
a.
Sun’s gravity
b.
Weak nuclear force
c.
Coulomb force
d.
Strong nuclear force
!
Yes, the strong nuclear force allows for the two similarly charged protons to stick.
e.
Gravitational attraction between nucleons
Your+answer+is+correct.
The correct answer is: Strong nuclear force
5/5/24, 11
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Question 11
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Question 12
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Select one:
Of the four basic elements necessary for life as we know it, three are made
a.
By large, diffuse clouds of gas and dust
b.
In terrestrial laboratories
c.
In supernovae explosions
d.
In the Big Bang
e.
in the interiors of stars.
!
Yup, ONC are all made by nuclear fusion in the cores of stars.
Your answer is correct.
The correct answer is: in the interiors of stars.
Select one:
Which stellar property is exclusive to the first generation of stars
?
a.
Short-lived
b.
High mass
c.
No
metals
!
Yes, metals (anything heavier than helium) was mostly made in the interiors of stars, so they would not have
been around for the first stars.
d.
High luminosity
e.
End up with supernova explosions
Your+answer+is+correct.
The correct answer is: No metals
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5/5/24, 11
:
13 PM
Chapter 3 HW: Attempt review | Moodle-in-Canvas
Page 7 of 9
https://lti.learn.illinois.edu/mod/quiz/review.php
?
attempt=11312011&cmid=1849556
5/5/24, 11
:
13 PM
Chapter 3 HW: Attempt review | Moodle-in-Canvas
Page 8 of 9
https://lti.learn.illinois.edu/mod/quiz/review.php
?
attempt=11312011&cmid=1849556
5/5/24, 11
:
13 PM
Chapter 3 HW: Attempt review | Moodle-in-Canvas
Page 9 of 9
https://lti.learn.illinois.edu/mod/quiz/review.php
?
attempt=11312011&cmid=1849556
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