Question 1

As a star evolves, heavier elements tend to form by various processes. Which of thefollowing is NOT one of these processes?

Accepted Answer

A)  proton capture and neutron capture
B)  fusion of like nuclei
C)  helium capture
D)  the s process
E)  neutronizationF) B) and C)
G) All of the above

Question 2

Which of these is the likely progenitor of a Type II supernova?

Accepted Answer

A)  a mass-transfer binary, with the white dwarf already at 1.3 solar masses
B)  a contact binary, with the neutron star at 2.3 solar masses
C)  an evolved red giant which is just starting to make silicon in its core
D)  two white dwarfs in a contact binary system
E)  an evolved blue supergiant that is about to experience the helium flashF) A) and D)
G) B) and D)

Question 3

What is the amount of energy emitted in the form of neutrinos, during a supernova explosion,compared to the amount of energy radiated as electromagnetic radiation?

Accepted Answer

A)  only .007 as much
B)  about equal amounts
C)  about twice as much
D)  ten times more
E)  100 times moreF) A) and B)
G) A) and E)

Question 4

The heaviest nuclei of all are formed:

Accepted Answer

A)  by neutron capture during a Type II supernova explosion.
B)  during a nova explosion.
C)  during a carbon detonation supernova.
D)  during carbon burning in the giant stage.
E)  during the triple alpha process.F) C) and D)
G) B) and E)

Question 5

Of all elements, ________ has the most stable and tightly bound nucleus.

Accepted Answer

The answer of Of all elements, ________ has the most...

Question 6

Because they all involve the detonation of a carbon-rich white dwarf at Chandrasekhar's limit,all Type I supernovae are equally luminous.

Accepted Answer

A) True 
 B)False

Question 7

What made supernova 1987A so useful to study?

Accepted Answer

A)  We saw direct evidence of nickel to iron decay in its light curve.
B)  Its progenitor had been observed previously.
C)  In the Large Magellanic Cloud, we already knew its distance.
D)  It occurred after new telescopes, such as Hubble, could observe it very closely.
E)  All of the above are correct.F) A) and B)
G) C) and E)

Question 8

After reaching its peak luminosity in hours or days, a nova declines in brightness over a periodof a few ________ before returning to its pre-explosion luminosity.

Accepted Answer

The answer of After reaching its peak luminosity in hours...

Exam 21: Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

What is the amount of energy emitted in the form of neutrinos, during a supernova explosion,compared to the amount of energy radiated as electromagnetic radiation?

Correct Answer
verified

Because they all involve the detonation of a carbon-rich white dwarf at Chandrasekhar's limit,all Type I supernovae are equally luminous.

Correct Answer
verified

What made supernova 1987A so useful to study?

Correct Answer
verified

As a star evolves, heavier elements tend to form by various processes. Which of thefollowing is NOT one of these processes?

Correct Answer
verified

Which of these is the likely progenitor of a Type II supernova?

Correct Answer
verified

After reaching its peak luminosity in hours or days, a nova declines in brightness over a periodof a few ________ before returning to its pre-explosion luminosity.

Correct Answer
verified

The heaviest nuclei of all are formed:

Correct Answer
verified

Of all elements, ________ has the most stable and tightly bound nucleus.

Correct Answer
verified

Exam 21: Stellar Explosions: Novae, Supernovae, and the Formation of the Elements

What is the amount of energy emitted in the form of neutrinos, during a supernova explosion,compared to the amount of energy radiated as electromagnetic radiation?

Correct AnswerverifiedShow Answer

Because they all involve the detonation of a carbon-rich white dwarf at Chandrasekhar's limit,all Type I supernovae are equally luminous.

Correct AnswerverifiedShow Answer

What made supernova 1987A so useful to study?

Correct AnswerverifiedShow Answer

As a star evolves, heavier elements tend to form by various processes. Which of thefollowing is NOT one of these processes?

Correct AnswerverifiedShow Answer

Which of these is the likely progenitor of a Type II supernova?

Correct AnswerverifiedShow Answer

After reaching its peak luminosity in hours or days, a nova declines in brightness over a periodof a few ________ before returning to its pre-explosion luminosity.

Correct AnswerverifiedShow Answer

The heaviest nuclei of all are formed:

Correct AnswerverifiedShow Answer

Of all elements, ________ has the most stable and tightly bound nucleus.

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified