Question 1

Theory predicts that neutron stars may not exceed 3 solar masses.

Accepted Answer

A) True 
 B)False

Question 2

What is the approximate size of the Schwarzschild radius of a one solar mass black hole?

Accepted Answer

A) 3 kilometres 
B) 1,500,000 kilometres, the size of the Sun 
C) 150,000,000 kilometres, or 1 AU 
D) 1013 kilometres, or 1 light-year 
A) 3 kilometres 
B) 1,500,000 kilometres, the size of the Sun 
C) 150,000,000 kilometres, or 1 AU 
D) 1013 kilometres, or 1 light-year

Question 3

Giant and supergiant stars are rare because that stage of stellar evolution is short.

Accepted Answer

A) True 
 B)False

Question 4

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.

Accepted Answer

A) True 
 B)False

Question 5

If neutron stars contain no nuclear fuel,why are they hot?

Accepted Answer

The answer of If neutron stars contain no nuclear fuel,why...

Question 6

-The diagram shows a light curve from a supernova.How many days after maximum light did it take for the supernova to decrease in brightness by 5 magnitudes?

Accepted Answer

A) less than 50 
B) 50 
C) 150 
D) 250 
A) less than 50 
B) 50 
C) 150 
D) 250

Question 7

Why can't the lowest mass stars become giants?

Accepted Answer

A) Their centres never get hot enough. 
B) Their rotation is too slow. 
C) They do not contain helium. 
D) They never use up their hydrogen. 
A) Their centres never get hot enough. 
B) Their rotation is too slow. 
C) They do not contain helium. 
D) They never use up their hydrogen.

Question 8

Which of the following offered support for the theory that the collapse of a massive star's iron core produces neutrinos?

Accepted Answer

A) the detection of neutrinos from the supernova of 1987 
B) the brightening of supernovae a few days after they are first visible 
C) underground counts of solar neutrinos 
D) laboratory measurements of the mass of the neutrino 
A) the detection of neutrinos from the supernova of 1987 
B) the brightening of supernovae a few days after they are first visible 
C) underground counts of solar neutrinos 
D) laboratory measurements of the mass of the neutrino

Question 9

Suppose you discover a binary star system with a 0.7 solar mass giant star and a 2 solar mass main sequence star.Why is this surprising?

Accepted Answer

A) 0.7 solar mass stars are not expected to become giants. 
B) All 2 solar mass stars should have left the main sequence. 
C) Giant stars are expected to destroy their companions, so the 2 solar mass star shouldn't exist. 
D) The 2 solar mass star should have become a giant before the 0.7 solar mass star. 
A) 0.7 solar mass stars are not expected to become giants. 
B) All 2 solar mass stars should have left the main sequence. 
C) Giant stars are expected to destroy their companions, so the 2 solar mass star shouldn't exist. 
D) The 2 solar mass star should have become a giant before the 0.7 solar mass star.

Question 10

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

Accepted Answer

A) True 
 B)False

Question 11

Why can't pulsars be spinning white dwarfs?

Accepted Answer

A) White dwarfs are not very common. 
B) White dwarfs are not dense enough to produce bright pulses. 
C) White dwarfs do not have magnetic fields. 
D) White dwarfs are too large to produce such short pulses. 
A) White dwarfs are not very common. 
B) White dwarfs are not dense enough to produce bright pulses. 
C) White dwarfs do not have magnetic fields. 
D) White dwarfs are too large to produce such short pulses.

Question 12

What is the term for a collection of 10⁵ to 10⁶ old stars in a region 30 to 100 light-years in diameter?

Accepted Answer

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

Question 13

Why does our theory predict that neutron stars will have strong magnetic fields?

Accepted Answer

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

Question 14

A three solar mass black hole has a Schwarzschild radius of about 9 km.How big would the Schrwarzschild radius of a 1000 solar mass black hole be?

Accepted Answer

A) 90 km 
B) 330 km 
C) 1000 km 
D) 3000 km 
A) 90 km 
B) 330 km 
C) 1000 km 
D) 3000 km

Question 15

From what part of the H-R diagram have the giants in a star cluster evolved?

Accepted Answer

The answer of From what part of the H-R diagram...

Question 16

If you had an extremely sensitive radio telescope,could you detect every pulsar in the Milky Way galaxy?

Accepted Answer

A) Yes, because all pulsars emit radio waves. 
B) Yes, because all pulsars are nearby. 
C) No, some pulsars don't flash all of the time. 
D) No, some pulsar beams don't point in the direction of Earth. 
A) Yes, because all pulsars emit radio waves. 
B) Yes, because all pulsars are nearby. 
C) No, some pulsars don't flash all of the time. 
D) No, some pulsar beams don't point in the direction of Earth.

Question 17

Which of the following would be most likely to indicate the presence of an isolated black hole?

Accepted Answer

A) bending of light from background stars 
B) emission of light from within an event horizon 
C) gravitational effects on a binary companion 
D) X-ray emission from an accretion disk 
A) bending of light from background stars 
B) emission of light from within an event horizon 
C) gravitational effects on a binary companion 
D) X-ray emission from an accretion disk

Question 18

How fast is the escape velocity at the event horizon around a black hole?

Accepted Answer

A) slower than the speed of light 
B) equal to the speed of light 
C) much faster than the speed of light 
D) the escape velocity depends on the mass of the black hole 
A) slower than the speed of light 
B) equal to the speed of light 
C) much faster than the speed of light 
D) the escape velocity depends on the mass of the black hole

Question 19

-What is the approximate age of the star cluster in the H-R diagram? 
(Hint: Main sequence stars of spectral types O and B have a core supply of hydrogen that is sufficient to last about 250 million years;types A and F,about 2 billion years;type G about 10 billion years;types K and M about 30 billion years.The apparent magnitude scale means that larger numbers are toward the bottom of the vertical axis.)

Accepted Answer

A) 200 million years 
B) 2 billion years 
C) 10 billion years 
D) 30 billion years 
A) 200 million years 
B) 2 billion years 
C) 10 billion years 
D) 30 billion years

Question 20

What properties of degenerate matter are important to the structure of stars? Why?

Accepted Answer

The answer of What properties of degenerate matter are important...

Theory predicts that neutron stars may not exceed 3 solar masses.

What is the approximate size of the Schwarzschild radius of a one solar mass black hole?

Giant and supergiant stars are rare because that stage of stellar evolution is short.

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.

If neutron stars contain no nuclear fuel,why are they hot?

-The diagram shows a light curve from a supernova.How many days after maximum light did it take for the supernova to decrease in brightness by 5 magnitudes?

Why can't the lowest mass stars become giants?

Which of the following offered support for the theory that the collapse of a massive star's iron core produces neutrinos?

Suppose you discover a binary star system with a 0.7 solar mass giant star and a 2 solar mass main sequence star.Why is this surprising?

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

Why can't pulsars be spinning white dwarfs?

What is the term for a collection of 10⁵ to 10⁶ old stars in a region 30 to 100 light-years in diameter?

Why does our theory predict that neutron stars will have strong magnetic fields?

A three solar mass black hole has a Schwarzschild radius of about 9 km.How big would the Schrwarzschild radius of a 1000 solar mass black hole be?

From what part of the H-R diagram have the giants in a star cluster evolved?

If you had an extremely sensitive radio telescope,could you detect every pulsar in the Milky Way galaxy?

Which of the following would be most likely to indicate the presence of an isolated black hole?

How fast is the escape velocity at the event horizon around a black hole?

What properties of degenerate matter are important to the structure of stars? Why?

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

Exam 8: The Deaths of Stars

Theory predicts that neutron stars may not exceed 3 solar masses.

What is the approximate size of the Schwarzschild radius of a one solar mass black hole?

Giant and supergiant stars are rare because that stage of stellar evolution is short.

Helium fusion does not begin until the star has entered the giant region of the H-R diagram.

If neutron stars contain no nuclear fuel,why are they hot?

-The diagram shows a light curve from a supernova.How many days after maximum light did it take for the supernova to decrease in brightness by 5 magnitudes?

Why can't the lowest mass stars become giants?

Which of the following offered support for the theory that the collapse of a massive star's iron core produces neutrinos?

Suppose you discover a binary star system with a 0.7 solar mass giant star and a 2 solar mass main sequence star.Why is this surprising?

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

Why can't pulsars be spinning white dwarfs?

What is the term for a collection of 10⁵ to 10⁶ old stars in a region 30 to 100 light-years in diameter?

Why does our theory predict that neutron stars will have strong magnetic fields?

A three solar mass black hole has a Schwarzschild radius of about 9 km.How big would the Schrwarzschild radius of a 1000 solar mass black hole be?

From what part of the H-R diagram have the giants in a star cluster evolved?

If you had an extremely sensitive radio telescope,could you detect every pulsar in the Milky Way galaxy?

Which of the following would be most likely to indicate the presence of an isolated black hole?

How fast is the escape velocity at the event horizon around a black hole?

What properties of degenerate matter are important to the structure of stars? Why?

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