Chapter 7

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Stars with masses below a certain threshold produce most of their energy via the proton-proton chain. What is that threshold?

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Which of the following is considered to be the best explanation for the missing solar neutrinos?

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How did observations at the Sudbury Neutrino Observatory solve the solar neutrino problem?

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Why does the main sequence have a limit at the lower end?

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Why is there a main sequence mass-luminosity relation?

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What is the approximate mass of the lowest mass object that can initiate the thermonuclear fusion of hydrogen?

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Which of the following is most similar in size to a brown dwarf?

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Which of the following are star-like objects that contain less than 0.08 solar masses and will never raise their core temperatures high enough that the proton-proton chain can begin?

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What would happen if the nuclear reactions in a star began to produce too much energy?

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How much of its lifetime does the average star spend on the main sequence?

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The lower edge of the main-sequence band represents the location in the H-R diagram at which stars begin their lives as main-sequence stars. What is it called?

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On the H-R diagram, the line indicates the location of the main sequence. Which of the four labeled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

1

Refer to the H-R diagram. Which point represents a star in which the proton-proton chain is occurring?

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The Sun has an expected main-sequence lifetime of about 10^10 years. What is the lifetime on the main sequence of a 2 solar mass star?

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What type of star is our Sun?

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What is the lifetime of a 10 solar mass star on the main sequence?

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What characteristic of a star primarily determines its location on the main sequence?

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In which option below are the stellar types sorted from shortest to longest main-sequence lifetime?

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Consider two stars of the same mass: star 1 has just moved on to the main sequence, and star 2 is about to leave it. How are these two stars different?

Astronomy

Stars with masses below a certain threshold produce most of their energy via the proton-proton chain. What is that threshold?

Which of the following is considered to be the best explanation for the missing solar neutrinos?

How did observations at the Sudbury Neutrino Observatory solve the solar neutrino problem?

Why does the main sequence have a limit at the lower end?

Why is there a main sequence mass-luminosity relation?

What is the approximate mass of the lowest mass object that can initiate the thermonuclear fusion of hydrogen?

Which of the following is most similar in size to a brown dwarf?

Which of the following are star-like objects that contain less than 0.08 solar masses and will never raise their core temperatures high enough that the proton-proton chain can begin?

What would happen if the nuclear reactions in a star began to produce too much energy?

How much of its lifetime does the average star spend on the main sequence?

The lower edge of the main-sequence band represents the location in the H-R diagram at which stars begin their lives as main-sequence stars. What is it called?

On the H-R diagram, the line indicates the location of the main sequence. Which of the four labeled locations on the H-R diagram indicates a luminosity and temperature similar to that of a T Tauri star?

Refer to the H-R diagram. Which point represents a star in which the proton-proton chain is occurring?

The Sun has an expected main-sequence lifetime of about 10^10 years. What is the lifetime on the main sequence of a 2 solar mass star?

What type of star is our Sun?

What is the lifetime of a 10 solar mass star on the main sequence?

What characteristic of a star primarily determines its location on the main sequence?

In which option below are the stellar types sorted from shortest to longest main-sequence lifetime?

Consider two stars of the same mass: star 1 has just moved on to the main sequence, and star 2 is about to leave it. How are these two stars different?