Exam 15: Surveying the Stars

The following questions refer to the sketch of the H-R diagram below.Please choose the best answer in each case,i.e. ,choice (a)refers to the entire main sequence,while (c)and (d)refer to only small parts of the main sequence.If choice (c)or (d)offers a better answer to a particular question than (a),use the best choice.You may use the same choice more than once. -Which group represents stars of the largest radii?

(Short Answer)

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Question 21

The following questions refer to the sketch of the H-R diagram below.Please choose the best answer in each case,i.e. ,choice (a)refers to the entire main sequence,while (c)and (d)refer to only small parts of the main sequence.If choice (c)or (d)offers a better answer to a particular question than (a),use the best choice.You may use the same choice more than once. -Which group represents stars of the smallest radii?

(Short Answer)

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Question 22

The following questions refer to the sketch of the H-R diagram below.Please choose the best answer in each case,i.e. ,choice (a)refers to the entire main sequence,while (c)and (d)refer to only small parts of the main sequence.If choice (c)or (d)offers a better answer to a particular question than (a),use the best choice.You may use the same choice more than once. -Which group includes stars that are burning helium in their cores?

(Short Answer)

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Question 23

The following questions refer to the sketch of the H-R diagram below.Please choose the best answer in each case,i.e. ,choice (a)refers to the entire main sequence,while (c)and (d)refer to only small parts of the main sequence.If choice (c)or (d)offers a better answer to a particular question than (a),use the best choice.You may use the same choice more than once. -Which group represents stars that are cool and dim?

(Short Answer)

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Question 24

Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond.The distance to this star is

(Multiple Choice)

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Question 25

Our Sun is a star of spectral type

(Multiple Choice)

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Question 26

A 10-solar-mass star is about ten times more luminous than a 1-solar-mass star.

(True/False)

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Question 27

Sirius is a star with spectral type A star and Rigel is a star with spectral type B star.What can we conclude?

(Multiple Choice)

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Question 28

You observe a star and you want to plot it on an H-R diagram.You will need to measure all of the following,except the star's

(Multiple Choice)

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Question 29

In a pulsating variable star,which characteristic of the star changes dramatically with time?

(Multiple Choice)

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Question 30

The choices below each describe the appearance of an H-R diagram for a different star cluster.Which cluster is most likely to be located in the halo of our galaxy?

(Multiple Choice)

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Question 31

In order to understand star clusters,we need to be able to estimate their ages.What technique do scientists use for this?

(Multiple Choice)

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Question 32

Which of the following luminosity classes refers to stars on the main sequence?

(Multiple Choice)

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Question 33

On a Hertzsprung-Russell diagram,where would we find white dwarfs?

(Multiple Choice)

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Question 34

What is a white dwarf?

(Multiple Choice)

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Question 35

Based on the definition of apparent brightness,which units are appropriate for its measurement?

(Multiple Choice)

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Question 36

The sketch below shows groups of stars on the H-R diagram labeled (a)through (e).Note that (a)represents the entire main sequence while (c)and (d)represent only small parts of the main sequence. -Which group represents stars fusing hydrogen in their cores?

(Multiple Choice)

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Question 37

We can measure stellar parallax for most stars in our galaxy.

(True/False)

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Question 38

A star's luminosity is the

(Multiple Choice)

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Question 39

On a Hertzsprung-Russell diagram,where on the main sequence would we find stars that have the greatest mass?

(Multiple Choice)

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Question 40

Showing 21 - 40 of 141

Exam 15: Surveying the Stars

Suppose that you measure the parallax angle for a particular star to be 0.5 arcsecond.The distance to this star is

Our Sun is a star of spectral type

A 10-solar-mass star is about ten times more luminous than a 1-solar-mass star.

Sirius is a star with spectral type A star and Rigel is a star with spectral type B star.What can we conclude?

You observe a star and you want to plot it on an H-R diagram.You will need to measure all of the following,except the star's

In a pulsating variable star,which characteristic of the star changes dramatically with time?

The choices below each describe the appearance of an H-R diagram for a different star cluster.Which cluster is most likely to be located in the halo of our galaxy?

In order to understand star clusters,we need to be able to estimate their ages.What technique do scientists use for this?

Which of the following luminosity classes refers to stars on the main sequence?

On a Hertzsprung-Russell diagram,where would we find white dwarfs?

What is a white dwarf?

Based on the definition of apparent brightness,which units are appropriate for its measurement?

The sketch below shows groups of stars on the H-R diagram labeled (a)through (e).Note that (a)represents the entire main sequence while (c)and (d)represent only small parts of the main sequence. -Which group represents stars fusing hydrogen in their cores?

We can measure stellar parallax for most stars in our galaxy.

A star's luminosity is the

On a Hertzsprung-Russell diagram,where on the main sequence would we find stars that have the greatest mass?

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