Question 1

Neutron stars were first discovered in the 1930's.

Accepted Answer

A) True 
 B)False

Question 2

Observations from the Compton Gamma Ray Observatory showed that gamma-ray bursters were located throughout the sky. This told us that

Accepted Answer

A) the bursts were not produced among stars in the disk of our galaxy. 
B) the bursts were not produced among stars in the nuclear bulge of our galaxy. 
C) the bursts are not associated with planets in our solar system. 
D) the bursts were not produced in our Sun. 
E) All of the other choices are correct. 
A) the bursts were not produced among stars in the disk of our galaxy. 
B) the bursts were not produced among stars in the nuclear bulge of our galaxy. 
C) the bursts are not associated with planets in our solar system. 
D) the bursts were not produced in our Sun. 
E) All of the other choices are correct.

Question 3

In the lighthouse model shown above, the light from the lighthouse sweeps out a region in the sky, representing a disk around a pulsar.

Accepted Answer

A) True 
 B)False

Question 4

Order the following from most to least dense:

Accepted Answer

A) black hole, neutron star, white dwarf 
B) white dwarf, neutron star, black hole 
C) black hole, white dwarf, neutron star 
D) neutron star, white dwarf, black hole 
A) black hole, neutron star, white dwarf 
B) white dwarf, neutron star, black hole 
C) black hole, white dwarf, neutron star 
D) neutron star, white dwarf, black hole

Question 5

At extremely high densities and temperatures, electrons can be forced to fuse with protons. This reaction produces

Accepted Answer

A) hydrogen. 
B) helium and energy. 
C) degenerate electrons. 
D) neutrons and neutrinos. 
E) large amounts of radio radiation. 
A) hydrogen. 
B) helium and energy. 
C) degenerate electrons. 
D) neutrons and neutrinos. 
E) large amounts of radio radiation.

Question 6

_________ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.

Accepted Answer

A) Hypernovae 
B) Collapsars 
C) Pulsars 
D) Kerr singularities 
E) Magnetars 
A) Hypernovae 
B) Collapsars 
C) Pulsars 
D) Kerr singularities 
E) Magnetars

Question 7

A(n) ____________________ periodically emits large amounts of X-ray radiation as material accretes around a neutron star or black hole.

Accepted Answer

The answer of A(n) ____________________ periodically emits large amounts of...

Question 8

A _________ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.

Accepted Answer

A) black hole 
B) neutron star 
C) white dwarf 
D) supernova remnant 
E) red dwarf 
A) black hole 
B) neutron star 
C) white dwarf 
D) supernova remnant 
E) red dwarf

Question 9

The size of a neutron star is

Accepted Answer

A) about the same as that of our Solar System. 
B) about the same as that of the Sun. 
C) about the same as Earth. 
D) smaller than any of these. 
A) about the same as that of our Solar System. 
B) about the same as that of the Sun. 
C) about the same as Earth. 
D) smaller than any of these.

Question 10

The peculiar system SS 433 
I.is emitting beams of energy and matter.
II.is producing a spectrum with both a red and a blue shift.
III.probably contains an accretion disk.
IV.is the result of a planetary nebula.

Accepted Answer

A) I 
B) III 
C) II & III 
D) I, II, & III 
E) I, II, III, & IV 
A) I 
B) III 
C) II & III 
D) I, II, & III 
E) I, II, III, & IV

Question 11

Hypernovae are

Accepted Answer

A) supernovae that occur when two red dwarfs collide. 
B) supernovae that occur when 10-solar-mass stars explode. 
C) supernovae that occur when stars more massive than 25 solar masses explode. 
D) one theory to explain the production of gamma-ray bursters. 
E) supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters. 
A) supernovae that occur when two red dwarfs collide. 
B) supernovae that occur when 10-solar-mass stars explode. 
C) supernovae that occur when stars more massive than 25 solar masses explode. 
D) one theory to explain the production of gamma-ray bursters. 
E) supernovae that occur when stars more massive than 25 solar masses explode and one theory to explain the production of gamma-ray bursters.

Question 12

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

Accepted Answer

event hori

Question 13

If the inner accretion disk around a black hole has a temperature of $10^6$ K, at what wavelength will it radiate the most energy (Hint: From Wien's law, λT =3,000,000 where λ is in nm and T is in K.)

Accepted Answer

A) $10^6$ nm 
B) 3 nm 
C) $3 × 10^6$ nm 
D) 1 nm 
E) $3 × 10^{11}$ nm 
A) $10^6$ nm 
B) 3 nm 
C) $3 × 10^6$ nm 
D) 1 nm 
E) $3 × 10^{11}$ nm

Question 14

Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be

Accepted Answer

A) less than 3 solar masses. 
B) more than 3 solar masses. 
C) between 0.4 and 1.4 solar masses. 
D) less than 0.4 solar masses. 
E) not larger than the masses of the stars that we can see. 
A) less than 3 solar masses. 
B) more than 3 solar masses. 
C) between 0.4 and 1.4 solar masses. 
D) less than 0.4 solar masses. 
E) not larger than the masses of the stars that we can see.

Question 15

Gamma-ray bursts seem to be associated with violent events involving _______________.

Accepted Answer

A) planets 
B) neutron stars 
C) black holes 
D) neutron stars or black holes 
A) planets 
B) neutron stars 
C) black holes 
D) neutron stars or black holes

Question 16

The stability of a neutron star is expected only if a neutron star is a ____________.

Accepted Answer

A) solid 
B) fluid 
C) gas 
D) All of the other choices are correct. 
A) solid 
B) fluid 
C) gas 
D) All of the other choices are correct.

Question 17

If the Sun and stars are supported by gas pressure, what supports a neutron star

Accepted Answer

Neutron

Question 18

in the following graph of a pulsar's motion in a binary from 0 to 2.5 hours, the radial velocity represents how fast the compact object is traveling away from Earth.

Accepted Answer

A) True 
 B)False

Question 19

The density of a neutron star is

Accepted Answer

A) about the same as that of a white dwarf. 
B) about the same as that of the Sun. 
C) about the same as an atomic nucleus. 
D) zero. 
A) about the same as that of a white dwarf. 
B) about the same as that of the Sun. 
C) about the same as an atomic nucleus. 
D) zero.

Question 20

A black hole can be thought of as

Accepted Answer

A) a very massive object of finite size. 
B) a shell of material expanding from a white dwarf. 
C) a massive body of infinitely small size. 
D) a burnt out white dwarf. 
A) a very massive object of finite size. 
B) a shell of material expanding from a white dwarf. 
C) a massive body of infinitely small size. 
D) a burnt out white dwarf.

Neutron stars were first discovered in the 1930's.

Observations from the Compton Gamma Ray Observatory showed that gamma-ray bursters were located throughout the sky. This told us that

In the lighthouse model shown above, the light from the lighthouse sweeps out a region in the sky, representing a disk around a pulsar.

Order the following from most to least dense:

At extremely high densities and temperatures, electrons can be forced to fuse with protons. This reaction produces

_________ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.

A(n) ____________________ periodically emits large amounts of X-ray radiation as material accretes around a neutron star or black hole.

A _________ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.

The size of a neutron star is

The peculiar system SS 433 I.is emitting beams of energy and matter. II.is producing a spectrum with both a red and a blue shift. III.probably contains an accretion disk. IV.is the result of a planetary nebula.

Hypernovae are

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

If the inner accretion disk around a black hole has a temperature of $10^6$ K, at what wavelength will it radiate the most energy (Hint: From Wien's law, λT =3,000,000 where λ is in nm and T is in K.)

Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be

Gamma-ray bursts seem to be associated with violent events involving _______________.

The stability of a neutron star is expected only if a neutron star is a ____________.

If the Sun and stars are supported by gas pressure, what supports a neutron star

in the following graph of a pulsar's motion in a binary from 0 to 2.5 hours, the radial velocity represents how fast the compact object is traveling away from Earth.

The density of a neutron star is

A black hole can be thought of as

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 11: Neutron Stars and Black Holes

Neutron stars were first discovered in the 1930's.

Observations from the Compton Gamma Ray Observatory showed that gamma-ray bursters were located throughout the sky. This told us that

In the lighthouse model shown above, the light from the lighthouse sweeps out a region in the sky, representing a disk around a pulsar.

Order the following from most to least dense:

At extremely high densities and temperatures, electrons can be forced to fuse with protons. This reaction produces

_________ are neutron stars that have magnetic fields 100 times stronger than the average neutron star.

A(n) ____________________ periodically emits large amounts of X-ray radiation as material accretes around a neutron star or black hole.

A _________ has a radius of about 10 km and is supported by the pressure associated with degenerate neutrons.

The size of a neutron star is

The peculiar system SS 433 I.is emitting beams of energy and matter. II.is producing a spectrum with both a red and a blue shift. III.probably contains an accretion disk. IV.is the result of a planetary nebula.

Hypernovae are

The ____________________ of a black hole is the radius from the black hole at which the escape velocity is equal to the speed of light.

If the inner accretion disk around a black hole has a temperature of 10610^6106 K, at what wavelength will it radiate the most energy (Hint: From Wien's law, λT =3,000,000 where λ is in nm and T is in K.)

Cygnus X-1 and LMC X-3 are black holes if the masses of the unseen companions perhaps may be

Gamma-ray bursts seem to be associated with violent events involving _______________.

The stability of a neutron star is expected only if a neutron star is a ____________.

If the Sun and stars are supported by gas pressure, what supports a neutron star

in the following graph of a pulsar's motion in a binary from 0 to 2.5 hours, the radial velocity represents how fast the compact object is traveling away from Earth.

The density of a neutron star is

A black hole can be thought of as

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

The Origin of the Solar System

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

If the inner accretion disk around a black hole has a temperature of $10^6$ K, at what wavelength will it radiate the most energy (Hint: From Wien's law, λT =3,000,000 where λ is in nm and T is in K.)