Question 1

A(n)  _________ is a collection of 10 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Accepted Answer

A)  Herbig-Haro object
B)  globular cluster
C)  open cluster
D)  giant cluster
E)  supernova C

Question 2

Explain the major differences between type II supernova and a type I supernova.

Accepted Answer

Supernovae that do not have hy...

Question 3

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula (1 pc is equal to  3×10133×10^{13}3×1013  km and 1 year is equal to  3.15×1073.15×10^73.15×107  seconds.)

Accepted Answer

A)  240 years
B)  790,000 years
C)  96,000 years
D)  960 years
E)  24,000 years

Question 4

The Chandrasekhar limit tells us that

Accepted Answer

A)  accretion disks can grow hot through friction.
B)  neutron stars of more than 3 solar masses are not stable.
C)  white dwarfs more massive than 1.4 solar masses are not stable.
D)  stars cannot travel through space too fast.
E)  stars with a mass less than 0.5 solar masses will not go through helium flash.

Question 5

The spectra of Type II supernova contain no hydrogen lines.

Accepted Answer

A) True 
 B)False

Question 6

A nova is a new star.

Accepted Answer

A) True 
 B)False

Question 7

A star begins fusing hydrogen to helium the moment it leaves the main sequence.

Accepted Answer

A) True 
 B)False

Question 8

The average size of a white dwarf is about the same size as the Earth.

Accepted Answer

A) True 
 B)False  True

Question 9

Type II supernovae are believed to occur when the cores of massive stars collapse.

Accepted Answer

A) True 
 B)False

Question 10

The triple-alpha process involves the fusion of

Accepted Answer

A)  three alpha particles.
B)  three neutral helium atoms.
C)  three alpha particles or three neutral helium atoms.
D)  None of the other choices are correct.

Question 11

What are the two longest stages in the life of a one-solar-mass star

Accepted Answer

A)  Protostar, pre-main-sequence
B)  Protostar, white dwarf
C)  Protostar, main-sequence
D)  Main-sequence, white dwarf

Question 12

Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)

Accepted Answer

A)  accretion disk.
B)  Lagrangian point.
C)  Algol paradox.
D)  planetary nebula.
E)  supernova remnant.

Question 13

A white dwarf converts __________________ energy into _________________ energy.

Accepted Answer

A)  nuclear, gravitational
B)  chemical, potential
C)  kinetic, potential
D)  gravitational, thermal

Question 14

Which of the following nuclear fuels does a one-solar-mass star fuse over the course of its entire evolution

Accepted Answer

A)  hydrogen
B)  hydrogen and helium
C)  hydrogen, helium and carbon
D)  hydrogen, helium, carbon, and neon
E)  hydrogen, helium, carbon, neon, and oxygen

Question 15

Stars that have ejected a planetary nebula eventually become

Accepted Answer

A)  protostars.
B)  brown dwarfs.
C)  white dwarfs.
D)  red giants.

Question 16

What nuclear fusion mechanism does an isolated white dwarf use to generate energy

Accepted Answer

A)  proton-proton chain
B)  CNO cycle
C)  triple alpha process
D)  white dwarfs don't generate their own energy.

Question 17

If the theory that novae occur in close binary systems is correct, then recurrent novae should

Accepted Answer

A)  produce synchrotron radiation.
B)  occur in regions of star formation.
C)  not occur in old star clusters.
D)  all be visual binaries.
E)  repeat after some interval.

Question 18

Giant and supergiant stars are rare because

Accepted Answer

A)  they do not form as often as main-sequence stars.
B)  the star blows up before the giant or supergiant stage is reached
C)  the giant or supergiant stage is very short.
D)  the giant or supergiant stage is very long

Question 19

Why can't a massive star generate energy through iron fusion

Accepted Answer

Iron is the most tightly bound of all atomic nuclei. Nuclear fusion is able to release energy by combining less tightly bound nuclei into a more tightly bound nucleus, but once the gas in the core of the star has been converted to iron, there are no nuclear reactions that can combine iron nuclei and release energy. The iron core is a dead end in the evolution of a massive star.

Question 20

The explosion of a supernova type II can leave behind

Accepted Answer

A)  a planetary nebula.
B)  a shell of hot, expanding gas with a white dwarf at the center.
C)  a shell of hot, expanding gas with a neutron star at the center.
D)  Nothing is ever left behind.

Exam 10: The Deaths of Stars

A(n) _________ is a collection of 10 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Correct Answer
verified
C

Explain the major differences between type II supernova and a type I supernova.

Correct Answer
verified
Supernovae that do not have hy...
View Answer

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula (1 pc is equal to $3×10^{13}$ km and 1 year is equal to $3.15×10^7$ seconds.)

Correct Answer
verified

The Chandrasekhar limit tells us that

Correct Answer
verified

The spectra of Type II supernova contain no hydrogen lines.

Correct Answer
verified

A nova is a new star.

Correct Answer
verified

A star begins fusing hydrogen to helium the moment it leaves the main sequence.

Correct Answer
verified

The average size of a white dwarf is about the same size as the Earth.

Correct Answer
verified
True

Type II supernovae are believed to occur when the cores of massive stars collapse.

Correct Answer
verified

The triple-alpha process involves the fusion of

Correct Answer
verified

What are the two longest stages in the life of a one-solar-mass star

Correct Answer
verified

Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)

Correct Answer
verified

A white dwarf converts __ energy into _ energy.

Correct Answer
verified

Which of the following nuclear fuels does a one-solar-mass star fuse over the course of its entire evolution

Correct Answer
verified

Stars that have ejected a planetary nebula eventually become

Correct Answer
verified

What nuclear fusion mechanism does an isolated white dwarf use to generate energy

Correct Answer
verified

If the theory that novae occur in close binary systems is correct, then recurrent novae should

Correct Answer
verified

Giant and supergiant stars are rare because

Correct Answer
verified

Why can't a massive star generate energy through iron fusion

The explosion of a supernova type II can leave behind

Correct Answer
verified

Exam 10: The Deaths of Stars

A(n) _________ is a collection of 10 to 1000 stars in a region about 25 pc in diameter. The stars in the collection are typically quite young.

Correct AnswerverifiedC

Explain the major differences between type II supernova and a type I supernova.

Correct AnswerverifiedSupernovae that do not have hy...View AnswerShow Answer

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula (1 pc is equal to 3×10133×10^{13}3×1013 km and 1 year is equal to 3.15×1073.15×10^73.15×107 seconds.)

Correct AnswerverifiedShow Answer

The Chandrasekhar limit tells us that

Correct AnswerverifiedShow Answer

The spectra of Type II supernova contain no hydrogen lines.

Correct AnswerverifiedShow Answer

A nova is a new star.

Correct AnswerverifiedShow Answer

A star begins fusing hydrogen to helium the moment it leaves the main sequence.

Correct AnswerverifiedShow Answer

The average size of a white dwarf is about the same size as the Earth.

Correct AnswerverifiedTrue

Type II supernovae are believed to occur when the cores of massive stars collapse.

Correct AnswerverifiedShow Answer

The triple-alpha process involves the fusion of

Correct AnswerverifiedShow Answer

What are the two longest stages in the life of a one-solar-mass star

Correct AnswerverifiedShow Answer

Mass is transferred from a normal star in a close binary system toward a white dwarf. The material that is transferred to the white dwarf forms a rapidly growing whirlpool of material known around the white dwarf known as a(n)

Correct AnswerverifiedShow Answer

A white dwarf converts __________________ energy into _________________ energy.

Correct AnswerverifiedShow Answer

Which of the following nuclear fuels does a one-solar-mass star fuse over the course of its entire evolution

Correct AnswerverifiedShow Answer

Stars that have ejected a planetary nebula eventually become

Correct AnswerverifiedShow Answer

What nuclear fusion mechanism does an isolated white dwarf use to generate energy

Correct AnswerverifiedShow Answer

If the theory that novae occur in close binary systems is correct, then recurrent novae should

Correct AnswerverifiedShow Answer

Giant and supergiant stars are rare because

Correct AnswerverifiedShow Answer

Why can't a massive star generate energy through iron fusion

The explosion of a supernova type II can leave behind

Correct AnswerverifiedShow Answer

Correct Answer
verified
C

Correct Answer
verified
Supernovae that do not have hy...
View Answer

A planetary nebula has a radius of 0.5 pc and is expanding at 20 km/s. What is the approximate age of this planetary nebula (1 pc is equal to $3×10^{13}$ km and 1 year is equal to $3.15×10^7$ seconds.)

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
True

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

A white dwarf converts __ energy into _ energy.

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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