Question 1

-Which point indicates the location on the H-R diagram of a one-solar-mass star when it stars to fuse helium?

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 2

What does the explosion of a type II supernova typically leave behind?

Accepted Answer

A) a planetary nebula 
B) a shell of hot, expanding gas with a white dwarf at the centre 
C) a shell of hot, expanding gas with a pulsar at the centre 
D) nothing is ever left behind 
A) a planetary nebula 
B) a shell of hot, expanding gas with a white dwarf at the centre 
C) a shell of hot, expanding gas with a pulsar at the centre 
D) nothing is ever left behind

Question 3

Why do we NOT expect to find a 5 solar mass neutron star?

Accepted Answer

We do not expect to find a 5 solar mass

Question 4

How are millisecond pulsars unusual compared to other pulsars?

Accepted Answer

A) Their spin rates are fast for their age. 
B) They only emit millimetre-wave radiation. 
C) They have strong magnetic fields. 
D) They are all X-ray binaries. 
A) Their spin rates are fast for their age. 
B) They only emit millimetre-wave radiation. 
C) They have strong magnetic fields. 
D) They are all X-ray binaries.

Question 5

Which of the following is an example of time dilation?

Accepted Answer

A) As material approaches a black hole event horizon, it appears redder and redder. 
B) The time that a star spends as a giant is much shorter than its main-sequence lifetime. 
C) Pulsars' pulsation periods slow down as they age. 
D) As a star approaches a black hole's event horizon, it appears to move more and more slowly. 
A) As material approaches a black hole event horizon, it appears redder and redder. 
B) The time that a star spends as a giant is much shorter than its main-sequence lifetime. 
C) Pulsars' pulsation periods slow down as they age. 
D) As a star approaches a black hole's event horizon, it appears to move more and more slowly.

Question 6

What do we call the region of the HR diagram that represents giant stars that are fusing helium in their cores and then in their shells?

Accepted Answer

A) turnoff point 
B) horizontal branch 
C) turn-on point 
D) main sequence 
A) turnoff point 
B) horizontal branch 
C) turn-on point 
D) main sequence

Question 7

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

Accepted Answer

A) True 
 B)False

Question 8

When a star with a mass comparable to that of the Sun dies,it becomes a black hole.

Accepted Answer

A) True 
 B)False

Question 9

Even in degenerate matter,pressure depends on temperature.

Accepted Answer

A) True 
 B)False

Question 10

When searching for black holes,what associated phenomena do astronomers search for?

Accepted Answer

A) single stars that emit large quantities of X-rays 
B) X-ray binaries where the compact companion has a mass in excess of 3 solar masses 
C) large spherical regions from which no light is detected 
D) pulsars with periods of less than one millisecond 
A) single stars that emit large quantities of X-rays 
B) X-ray binaries where the compact companion has a mass in excess of 3 solar masses 
C) large spherical regions from which no light is detected 
D) pulsars with periods of less than one millisecond

Question 11

To tell the difference between a neutron star and a black hole in an X-ray binary,we must find the temperature of the object.

Accepted Answer

A) True 
 B)False

Question 12

Why might we suspect that a black hole in a binary system could emit X-rays?

Accepted Answer

The answer of Why might we suspect that a black...

Question 13

When does a type-II supernova occur?

Accepted Answer

A) when a white dwarf's mass exceeds the Chandrasekhar-Landau limit 
B) when the iron core of a massive star collapses 
C) directly following a helium flash 
D) when two neutron stars collide 
A) when a white dwarf's mass exceeds the Chandrasekhar-Landau limit 
B) when the iron core of a massive star collapses 
C) directly following a helium flash 
D) when two neutron stars collide

Question 14

Why does our theory predict that neutron stars will spin rapidly?

Accepted Answer

The answer of Why does our theory predict that neutron...

Question 15

Neutron stars were first discovered in the 1930s.

Accepted Answer

A) True 
 B)False

Question 16

Planetary nebulae are sites of planet formation.

Accepted Answer

A) True 
 B)False

Question 17

If the hypothesis that novae occur in close binary systems is correct,then which of the following should novae do?

Accepted Answer

A) They should produce synchrotron radiation. 
B) They should occur in regions of star formation. 
C) They should all be visual binaries. 
D) They should repeat after some interval. 
A) They should produce synchrotron radiation. 
B) They should occur in regions of star formation. 
C) They should all be visual binaries. 
D) They should repeat after some interval.

Question 18

Why are giant and supergiant stars rare?

Accepted Answer

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

Question 19

What happens when light travels out of a gravitational field,loses energy,and its wavelength grows longer?

Accepted Answer

A) a gravitational blue shift 
B) the solar wind 
C) a gravitational red shift 
D) a pulsar wind 
A) a gravitational blue shift 
B) the solar wind 
C) a gravitational red shift 
D) a pulsar wind

Question 20

A Type II supernova produces a planetary nebula.

Accepted Answer

A) True 
 B)False

-Which point indicates the location on the H-R diagram of a one-solar-mass star when it stars to fuse helium?

What does the explosion of a type II supernova typically leave behind?

Why do we NOT expect to find a 5 solar mass neutron star?

How are millisecond pulsars unusual compared to other pulsars?

Which of the following is an example of time dilation?

What do we call the region of the HR diagram that represents giant stars that are fusing helium in their cores and then in their shells?

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

When a star with a mass comparable to that of the Sun dies,it becomes a black hole.

Even in degenerate matter,pressure depends on temperature.

When searching for black holes,what associated phenomena do astronomers search for?

To tell the difference between a neutron star and a black hole in an X-ray binary,we must find the temperature of the object.

Why might we suspect that a black hole in a binary system could emit X-rays?

When does a type-II supernova occur?

Why does our theory predict that neutron stars will spin rapidly?

Neutron stars were first discovered in the 1930s.

Planetary nebulae are sites of planet formation.

If the hypothesis that novae occur in close binary systems is correct,then which of the following should novae do?

Why are giant and supergiant stars rare?

What happens when light travels out of a gravitational field,loses energy,and its wavelength grows longer?

A Type II supernova produces a planetary nebula.

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

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Exam 8: The Deaths of Stars

-Which point indicates the location on the H-R diagram of a one-solar-mass star when it stars to fuse helium?

What does the explosion of a type II supernova typically leave behind?

Why do we NOT expect to find a 5 solar mass neutron star?

How are millisecond pulsars unusual compared to other pulsars?

Which of the following is an example of time dilation?

What do we call the region of the HR diagram that represents giant stars that are fusing helium in their cores and then in their shells?

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

When a star with a mass comparable to that of the Sun dies,it becomes a black hole.

Even in degenerate matter,pressure depends on temperature.

When searching for black holes,what associated phenomena do astronomers search for?

To tell the difference between a neutron star and a black hole in an X-ray binary,we must find the temperature of the object.

Why might we suspect that a black hole in a binary system could emit X-rays?

When does a type-II supernova occur?

Why does our theory predict that neutron stars will spin rapidly?

Neutron stars were first discovered in the 1930s.

Planetary nebulae are sites of planet formation.

If the hypothesis that novae occur in close binary systems is correct,then which of the following should novae do?

Why are giant and supergiant stars rare?

What happens when light travels out of a gravitational field,loses energy,and its wavelength grows longer?

A Type II supernova produces a planetary nebula.

The Scale of the Cosmos

User's Guide to the Sky

The Origin of Modern Astronomy

Astronomical Telescopes and Instruments

Sun Light and Sun Atoms

The Family of Stars

The Structure and Formation of Stars

The Milky Way Galaxy

Galaxies

Cosmology in the 21st Century

The Origin of the Solar System

Comparative Planetology of the Terrestrial Planets

Comparative Planetology of the Jovian Planets

Life on Other Worlds

Filters