2024 ASTRONOMY 1010 CLEMSION EXAM / NEWEST
2024 ASTRONOMY 1010 CLEMSION FINAL EXAM ALL
100 ACTUAL EXAM QUESTIONS AND WELL
ELABORATED ANSWERS (100% CORRECT VERIFIED
SOLUTIOINS) A NEW UPDATED VERSION 2024 |
GUARANTEED PASS A+ (BRAND NEW!!)
Which two energy sources can help a star maintain its internal thermal pressure? -
ANSWER: Nuclear fusion and gravitational contraction
What is the source of luminosity for protostars that have not yet become hot enough
for fusion in their cores? - ANSWER: Gravitational energy released by infalling matter
What can we learn about a star from its life track on an H-R diagram? - ANSWER:
What surface temperature and luminosity it will have at each stage of life
Which of the following statements about degeneracy pressure is not true? -
ANSWER: Degeneracy pressure varies with the temperature of the star
What percentage of a star's total lifetime is spent on the main sequence? - ANSWER:
90%
What happens when a star like the sun exhausts its core hydrogen supply? -
ANSWER: Its core contracts, but its outer layers expand and the star becomes bigger
and brighter
Helium fusion directly results in the formation of - ANSWER: Carbon
What happens after the helium flash in the core of a star? - ANSWER: The core
quickly heats up and expands as helium fusion begins all at once throughout the core
Which of the following sequences correctly describes the stages of life for a one solar
mass star? - ANSWER: Protostar, main-sequence, red giant, white dwarf
What is the CNO cycle? - ANSWER: a type of hydrogen fusion that uses carbon,
nitrogen, and oxygen nuclei as catalysts
Why does stellar main-sequence lifetime decrease with increasing stellar mass? -
ANSWER: Higher core temperatures cause fusion to proceed much more rapidly
Which element has the lowest mass per nuclear particle and therefore cannot
release energy by either fusion or fission? - ANSWER: Iron
, What happens when the gravity of a massive star's collapsing core is able to
overcome neutron degeneracy pressure? - ANSWER: The core contracts and
becomes a black hole
Which of the following statements about the stages of nuclear burning in a massive
star is not true? - ANSWER: Each successive stage lasts for approximately as long as
the first, hydrogen fusion stage.
Which event marks the beginning of a supernova? - ANSWER: The sudden collapse of
an iron core into a compact ball of neutrons
You discover a binary star system in which one member is a 15 solar mass main-
sequence star and the other star is a 10 solar mass giant star. Why should you be
surprised, at least at first? - ANSWER: The two stars should be the same age, so the
more massive one should have become a giant first
Consider a large molecular cloud that will give birth to a cluster of stars. Which of the
following would you expect to be true? - ANSWER: A few massive stars will form,
live, and die before the majority of the star's clusters even complete their protostar
stage.
This diagram represents the life track of a 1 solar mass star. Refer to the life stages
labeled with roman numerals. Which stage lasts the longest? - ANSWER: Main
sequence line
Carbon fusion occurs in high-mass stars but not in low-mass stars because... -
ANSWER: The cores of low-mass stars never get hot enough for carbon fusion
A spinning neutron star has been observed at the center of a - ANSWER: Supernova
remnant
Degeneracy pressure stops the crush of gravity in all the following except - ANSWER:
A very massive main-sequence star
Suppose a white dwarf is gaining mass because of accretion from a binary
companion. What happens if its mass reaches the 1.4 solar mass limit? - ANSWER:
Temperatures skyrocket to the point where carbon fusion is possible, which leads to
a white dwarf supernova explosion
Which of the following statements about novae is not true? - ANSWER: Our Sun will
probably undergo at least one nova when it becomes a white dwarf about 5 billion
years from now
What kind of star is most likely to become a white-dwarf supernova? - ANSWER: A
white dwarf star with a red giant binary companion
2024 ASTRONOMY 1010 CLEMSION FINAL EXAM ALL
100 ACTUAL EXAM QUESTIONS AND WELL
ELABORATED ANSWERS (100% CORRECT VERIFIED
SOLUTIOINS) A NEW UPDATED VERSION 2024 |
GUARANTEED PASS A+ (BRAND NEW!!)
Which two energy sources can help a star maintain its internal thermal pressure? -
ANSWER: Nuclear fusion and gravitational contraction
What is the source of luminosity for protostars that have not yet become hot enough
for fusion in their cores? - ANSWER: Gravitational energy released by infalling matter
What can we learn about a star from its life track on an H-R diagram? - ANSWER:
What surface temperature and luminosity it will have at each stage of life
Which of the following statements about degeneracy pressure is not true? -
ANSWER: Degeneracy pressure varies with the temperature of the star
What percentage of a star's total lifetime is spent on the main sequence? - ANSWER:
90%
What happens when a star like the sun exhausts its core hydrogen supply? -
ANSWER: Its core contracts, but its outer layers expand and the star becomes bigger
and brighter
Helium fusion directly results in the formation of - ANSWER: Carbon
What happens after the helium flash in the core of a star? - ANSWER: The core
quickly heats up and expands as helium fusion begins all at once throughout the core
Which of the following sequences correctly describes the stages of life for a one solar
mass star? - ANSWER: Protostar, main-sequence, red giant, white dwarf
What is the CNO cycle? - ANSWER: a type of hydrogen fusion that uses carbon,
nitrogen, and oxygen nuclei as catalysts
Why does stellar main-sequence lifetime decrease with increasing stellar mass? -
ANSWER: Higher core temperatures cause fusion to proceed much more rapidly
Which element has the lowest mass per nuclear particle and therefore cannot
release energy by either fusion or fission? - ANSWER: Iron
, What happens when the gravity of a massive star's collapsing core is able to
overcome neutron degeneracy pressure? - ANSWER: The core contracts and
becomes a black hole
Which of the following statements about the stages of nuclear burning in a massive
star is not true? - ANSWER: Each successive stage lasts for approximately as long as
the first, hydrogen fusion stage.
Which event marks the beginning of a supernova? - ANSWER: The sudden collapse of
an iron core into a compact ball of neutrons
You discover a binary star system in which one member is a 15 solar mass main-
sequence star and the other star is a 10 solar mass giant star. Why should you be
surprised, at least at first? - ANSWER: The two stars should be the same age, so the
more massive one should have become a giant first
Consider a large molecular cloud that will give birth to a cluster of stars. Which of the
following would you expect to be true? - ANSWER: A few massive stars will form,
live, and die before the majority of the star's clusters even complete their protostar
stage.
This diagram represents the life track of a 1 solar mass star. Refer to the life stages
labeled with roman numerals. Which stage lasts the longest? - ANSWER: Main
sequence line
Carbon fusion occurs in high-mass stars but not in low-mass stars because... -
ANSWER: The cores of low-mass stars never get hot enough for carbon fusion
A spinning neutron star has been observed at the center of a - ANSWER: Supernova
remnant
Degeneracy pressure stops the crush of gravity in all the following except - ANSWER:
A very massive main-sequence star
Suppose a white dwarf is gaining mass because of accretion from a binary
companion. What happens if its mass reaches the 1.4 solar mass limit? - ANSWER:
Temperatures skyrocket to the point where carbon fusion is possible, which leads to
a white dwarf supernova explosion
Which of the following statements about novae is not true? - ANSWER: Our Sun will
probably undergo at least one nova when it becomes a white dwarf about 5 billion
years from now
What kind of star is most likely to become a white-dwarf supernova? - ANSWER: A
white dwarf star with a red giant binary companion
