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Chapter 17 Reading Quiz Clickers
The Cosmic Perspective Seventh Edition
© 2014 Pearson Education, Inc.
Star Stuff
Chapter 17
© 2014 Pearson Education, Inc.
17.1 Lives in the Balance
• How does a star's mass affect nuclear fusion?
Chapter 17
© 2014 Pearson Education, Inc.
High-mass stars are those stars born with masses greater than about
a) 3 solar masses. b) 8 solar masses. c) 16 solar masses. d) 35 solar masses.
Chapter 17
© 2014 Pearson Education, Inc.
High-mass stars are those stars born with masses greater than about
a) 3 solar masses. b) 8 solar masses. c) 16 solar masses. d) 35 solar masses.
Chapter 17
© 2014 Pearson Education, Inc.
17.2 Life as a Low-Mass Star
• What are the life stages of a low-mass star? • How does a low-mass star die?
Chapter 17
© 2014 Pearson Education, Inc.
How does a main-sequence star's convection zone depend on its mass?
a) More massive stars have larger convection zones. b) Less massive stars have larger convection zones. c) High mass stars have convective cores. d) Low mass stars have no convection. e) B and C
Chapter 17
© 2014 Pearson Education, Inc.
How does a main-sequence star's convection zone depend on its mass?
a) More massive stars have larger convection zones. b) Less massive stars have larger convection zones. c) High mass stars have convective cores. d) Low mass stars have no convection. e) B and C
Chapter 17
© 2014 Pearson Education, Inc.
What spectral type are flare stars?
a) O b) A c) K d) M e) L
Chapter 17
© 2014 Pearson Education, Inc.
What spectral type are flare stars?
a) O b) A c) K d) M e) L
Chapter 17
© 2014 Pearson Education, Inc.
When a low-mass star can no longer fuse hydrogen into helium in its core,
a) hydrogen fusion will begin in a shell around the core.
b) helium will begin to fuse into carbon in the core. c) all fusion reactions stop and the star becomes a
white dwarf. d) the outer layers of the star blow off in a slow but
massive stellar wind.
Chapter 17
© 2014 Pearson Education, Inc.
When a low-mass star can no longer fuse hydrogen into helium in its core,
a) hydrogen fusion will begin in a shell around the core.
b) helium will begin to fuse into carbon in the core. c) all fusion reactions stop and the star becomes a
white dwarf. d) the outer layers of the star blow off in a slow but
massive stellar wind.
Chapter 17
© 2014 Pearson Education, Inc.
When does the expansion of a red giant stop?
a) when it reaches a size of about 200 times the size of the Sun
b) when hydrogen shell burning begins c) when hydrogen shell burning stops d) when helium fusion begins in the core
Chapter 17
© 2014 Pearson Education, Inc.
When does the expansion of a red giant stop?
a) when it reaches a size of about 200 times the size of the Sun
b) when hydrogen shell burning begins c) when hydrogen shell burning stops d) when helium fusion begins in the core
Chapter 17
© 2014 Pearson Education, Inc.
What powers stars on the horizontal branch of the Hertzsprung-Russell diagram?
a) helium fusion in the core and hydrogen shell fusion
b) hydrogen shell fusion c) hydrogen fusion in the core d) gravitational contraction
Chapter 17
© 2014 Pearson Education, Inc.
What powers stars on the horizontal branch of the Hertzsprung-Russell diagram?
a) helium fusion in the core and hydrogen shell fusion
b) hydrogen shell fusion c) hydrogen fusion in the core d) gravitational contraction
Chapter 17
© 2014 Pearson Education, Inc.
What nuclear reaction(s) takes place in a carbon star?
a) helium fusion in the core b) hydrogen shell fusion c) helium shell fusion d) all of the above e) B and C
Chapter 17
© 2014 Pearson Education, Inc.
What nuclear reaction(s) takes place in a carbon star?
a) helium fusion in the core b) hydrogen shell fusion c) helium shell fusion d) all of the above e) B and C
Chapter 17
© 2014 Pearson Education, Inc.
What is a planetary nebula?
a) a red supergiant b) the remnants of a supernova c) gas ejected and ionized by a dying low-mass
star d) gas and dust forming planets around a protostar
Chapter 17
© 2014 Pearson Education, Inc.
What is a planetary nebula?
a) a red supergiant b) the remnants of a supernova c) gas ejected and ionized by a dying low-mass
star d) gas and dust forming planets around a protostar
Chapter 17
© 2014 Pearson Education, Inc.
17.3 Life as a High-Mass Star
• What are the life stages of a high-mass star? • How do high-mass stars make the elements
necessary for life? • How does a high-mass star die?
Chapter 17
© 2014 Pearson Education, Inc.
What is the net product of the CNO cycle?
a) helium b) carbon c) nitrogen d) oxygen e) all of the above
Chapter 17
© 2014 Pearson Education, Inc.
What is the net product of the CNO cycle?
a) helium b) carbon c) nitrogen d) oxygen e) all of the above
Chapter 17
© 2014 Pearson Education, Inc.
What happens in a high-mass star after it stops core hydrogen fusion?
a) Hydrogen shell fusion starts. b) A helium flash occurs. c) Helium core fusion starts gradually. d) A and B e) A and C
Chapter 17
© 2014 Pearson Education, Inc.
What happens in a high-mass star after it stops core hydrogen fusion?
a) Hydrogen shell fusion starts. b) A helium flash occurs. c) Helium core fusion starts gradually. d) A and B e) A and C
Chapter 17
© 2014 Pearson Education, Inc.
What reaction produces oxygen from carbon in high-mass stars?
a) helium capture b) CNO cycle c) proton-proton capture d) proton-proton chain e) proton-neutron capture
Chapter 17
© 2014 Pearson Education, Inc.
What reaction produces oxygen from carbon in high-mass stars?
a) helium capture b) CNO cycle c) proton-proton capture d) proton-proton chain e) proton-neutron capture
Chapter 17
© 2014 Pearson Education, Inc.
What is the heaviest element produced in the core of a high-mass star?
a) carbon b) silicon c) iron d) lead e) uranium
Chapter 17
© 2014 Pearson Education, Inc.
What is the heaviest element produced in the core of a high-mass star?
a) carbon b) silicon c) iron d) lead e) uranium
Chapter 17
© 2014 Pearson Education, Inc.
What observations support our understanding of the origin of elements?
a) The spectra of older stars show less heavy elements than the spectra of newer stars.
b) Elements heavier than iron are very rare. c) Heavy elements with an even number of protons are
more common than those with an odd number of protons.
d) all of the above e) A and B
Chapter 17
© 2014 Pearson Education, Inc.
What observations support our understanding of the origin of elements?
a) The spectra of older stars show less heavy elements than the spectra of newer stars.
b) Elements heavier than iron are very rare. c) Heavy elements with an even number of protons are
more common than those with an odd number of protons.
d) all of the above e) A and B
Chapter 17
© 2014 Pearson Education, Inc.
What is the source of energy in a supernova?
a) nuclear fusion b) nuclear fission c) gravitational potential energy d) chemical potential energy
Chapter 17
© 2014 Pearson Education, Inc.
What is the source of energy in a supernova?
a) nuclear fusion b) nuclear fission c) gravitational potential energy d) chemical potential energy
Chapter 17
© 2014 Pearson Education, Inc.
What is produced in the core of a star that goes supernova?
a) neutrons and positrons b) neutrons and neutrinos c) protons and neutrinos d) electrons and positrons e) protons and positrons
Chapter 17
© 2014 Pearson Education, Inc.
What is produced in the core of a star that goes supernova?
a) neutrons and positrons b) neutrons and neutrinos c) protons and neutrinos d) electrons and positrons e) protons and positrons
Chapter 17
© 2014 Pearson Education, Inc.
In what stage does a high-mass star spend most of its life?
a) protostar b) main-sequence star c) red supergiant d) helium-burning supergiant e) multiple shell-burning supergiant
Chapter 17
© 2014 Pearson Education, Inc.
In what stage does a high-mass star spend most of its life?
a) protostar b) main-sequence star c) red supergiant d) helium-burning supergiant e) multiple shell-burning supergiant
Chapter 17
© 2014 Pearson Education, Inc.
17.4 The Roles of Mass and Mass Exchange
• How does a star's mass determine its life story?
Chapter 17
© 2014 Pearson Education, Inc.
How can a binary star have a red giant that is less massive than its main-sequence companion?
a) The red giant lost mass to the main-sequence star. b) The main-sequence star formed later than the red giant. c) The red giant had accelerated evolution due to more
heavy elements. d) The main-sequence star had slower evolution due to
winds from the red giant. e) The red giant had faster evolution due to winds from the
main-sequence star.
Chapter 17
© 2014 Pearson Education, Inc.
How can a binary star have a red giant that is less massive than its main-sequence companion?
a) The red giant lost mass to the main-sequence star. b) The main-sequence star formed later than the red giant. c) The red giant had accelerated evolution due to more
heavy elements. d) The main-sequence star had slower evolution due to
winds from the red giant. e) The red giant had faster evolution due to winds from the
main-sequence star.