Question 1

An astronomer examining a compact object could conclude that it was a black hole if it _____.

Accepted Answer

A)  emits regular pulses of radiation 
B)  has a defined event horizon that emits X-rays 
C)  has an accretion disk 
D)  has a mass greater than 1.4 solar masses 
E)  has a mass greater than 3 solar masses 
A)  emits regular pulses of radiation 
B)  has a defined event horizon that emits X-rays 
C)  has an accretion disk 
D)  has a mass greater than 1.4 solar masses 
E)  has a mass greater than 3 solar masses

Question 2

A hypernova is a violent event caused by _____.

Accepted Answer

A)  the merger of two neutron stars 
B)  the collapse of a rapidly rotating massive star 
C)  the fusion of a layer of degenerate helium deposited on the surface of a neutron star 
D)  carbon deflagration in a neutron star 
E)  the crossing of jets from two compact objects 
A)  the merger of two neutron stars 
B)  the collapse of a rapidly rotating massive star 
C)  the fusion of a layer of degenerate helium deposited on the surface of a neutron star 
D)  carbon deflagration in a neutron star 
E)  the crossing of jets from two compact objects

Question 3

The jets emitted by compact objects are made of _____.

Accepted Answer

A)  X-rays 
B)  atomic nuclei 
C)  neutrons 
D)  neutrinos 
E)  positrons 
A)  X-rays 
B)  atomic nuclei 
C)  neutrons 
D)  neutrinos 
E)  positrons

Question 4

What evidence did astronomers use to prove jets travel in opposite directions?

Accepted Answer

A)  spectral lines from fast-moving red- and blue-shifted ionized gas 
B)  gamma ray emission spectra 
C)  magnetic tubes in accretion disks 
D)  mass transfer from a binary star to a compact companion 
E)  pulsar rotation periods 
A)  spectral lines from fast-moving red- and blue-shifted ionized gas 
B)  gamma ray emission spectra 
C)  magnetic tubes in accretion disks 
D)  mass transfer from a binary star to a compact companion 
E)  pulsar rotation periods

Question 5

The laws of physics demand that a neutron star has a maximum mass of ____ solar mass(es).

Accepted Answer

A)  1 
B)  1.4 
C)  3 
D)  8 
E)  20 
A)  1 
B)  1.4 
C)  3 
D)  8 
E)  20

Question 6

A pulsar emits bursts of radio photons.

Accepted Answer

A) True 
 B)False

Question 7

Gamma ray bursts never last longer than a minute.

Accepted Answer

A) True 
 B)False

Question 8

Match between columns
                        Premises: Determined the density of matter needed to create a black hole
Determined the maximum mass of a white dwarf star
Postulated that nothing can move faster than light
Described the method of mass transfer in binary systems
Formulated advanced theories of black holes

Accepted Answer

The Answer of Schwarzschild and Roche and Einstein and Hawking is...

Question 9

The _______________ model explains pulsars using beams of radiation that sweep around the sky.

Accepted Answer

lighthouse

An astronomer examining a compact object could conclude that it was a black hole if it _____.

A hypernova is a violent event caused by _____.

The jets emitted by compact objects are made of _____.

What evidence did astronomers use to prove jets travel in opposite directions?

The laws of physics demand that a neutron star has a maximum mass of ____ solar mass(es).

A pulsar emits bursts of radio photons.

Gamma ray bursts never last longer than a minute.

The _______________ model explains pulsars using beams of radiation that sweep around the sky.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters

Exam 14: Neutron Stars and Black Holes

An astronomer examining a compact object could conclude that it was a black hole if it _____.

A hypernova is a violent event caused by _____.

The jets emitted by compact objects are made of _____.

What evidence did astronomers use to prove jets travel in opposite directions?

The laws of physics demand that a neutron star has a maximum mass of ____ solar mass(es).

A pulsar emits bursts of radio photons.

Gamma ray bursts never last longer than a minute.

The _______________ model explains pulsars using beams of radiation that sweep around the sky.

Here and Now

A Users Guide to the Sky

Moon Phases and Eclipses

Origins of Modern Astronomy

Gravity

Light and Telescopes

Atoms and Spectra

The Sun

The Family of Stars

The Interstellar Medium

Formation and Structure of Stars

Stellar Evolution

Deaths of Stars

The Milky Way Galaxy

Galaxies

Supermassive Black Holes and Active Galaxies

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth the Active Planet

The Moon and Mercury

Venus and Mars

Jupiter and Saturn

Uranus Neptune Pluto and the Kuiper Belt

Meteorites Asteroids and Comets

Astrobiology

Filters