Question 1

The Schwarzschild radius describes the size of a(n)

Accepted Answer

A) Black hole 
B) Neutron star 
C) Accretion disk 
D) White dwarf 
A) Black hole 
B) Neutron star 
C) Accretion disk 
D) White dwarf

Question 2

Which is not an end point of a star's evolutionary life?

Accepted Answer

A) Black hole. 
B) Neutron star. 
C) White dwarf. 
D) Red giant. 
A) Black hole. 
B) Neutron star. 
C) White dwarf. 
D) Red giant.

Question 3

Pulsars are

Accepted Answer

A) Spinning neutron stars with beamed radio emission 
B) Black holes with accretion disks 
C) Pulsating red giant stars with close companions 
D) White dwarfs with periodic stellar winds 
E) Binary systems with regular eclipses 
A) Spinning neutron stars with beamed radio emission 
B) Black holes with accretion disks 
C) Pulsating red giant stars with close companions 
D) White dwarfs with periodic stellar winds 
E) Binary systems with regular eclipses

Question 4

Suppose a star collapses and produces a black hole.The size of the event horizon of the black hole is determined entirely by the star's

Accepted Answer

A) Mass and chemical composition 
B) Age 
C) Luminosity and temperature 
D) Mass alone 
A) Mass and chemical composition 
B) Age 
C) Luminosity and temperature 
D) Mass alone

Question 5

The object at the center of the Crab Nebula is

Accepted Answer

A) A massive O star 
B) A neutron star 
C) A 10 solar mass black hole. 
D) An X-ray binary 
E) A white dwarf 
A) A massive O star 
B) A neutron star 
C) A 10 solar mass black hole. 
D) An X-ray binary 
E) A white dwarf

Question 6

Compared to low mass white dwarfs,massive white dwarfs are

Accepted Answer

A) Smaller and less dense 
B) Smaller and denser 
C) Larger and denser 
D) Larger and less dense 
A) Smaller and less dense 
B) Smaller and denser 
C) Larger and denser 
D) Larger and less dense

Question 7

What happens to the light from a star that has contracted within its event horizon?

Accepted Answer

A) It cannot escape from the region around the star 
B) It begins to travel faster than the speed of light 
C) It has a strong blue shift 
D) There is no longer any relationship between wavelength and energy 
A) It cannot escape from the region around the star 
B) It begins to travel faster than the speed of light 
C) It has a strong blue shift 
D) There is no longer any relationship between wavelength and energy

Question 8

The radius of the black hole that could be produced from the contraction of a star like the Sun would be about

Accepted Answer

A) The same as the radius of the Earth 
B) 3 km 
C) 1 AU 
D) 21 cm 
A) The same as the radius of the Earth 
B) 3 km 
C) 1 AU 
D) 21 cm

Question 9

According to general relativity,what effect does matter have on space?

Accepted Answer

A) Matter causes space to exert gravitational forces 
B) Matter curves space 
C) Matter causes space to expand 
D) Matter causes space to contract 
A) Matter causes space to exert gravitational forces 
B) Matter curves space 
C) Matter causes space to expand 
D) Matter causes space to contract

Question 10

A rotating neutron star is called a

Accepted Answer

A) Pulsar 
B) White dwarf 
C) Black hole 
D) Quasar 
A) Pulsar 
B) White dwarf 
C) Black hole 
D) Quasar

Question 11

The Chandrasekhar limit is the

Accepted Answer

A) Greatest mass a white dwarf can have 
B) Most massive main sequence star that can exist 
C) Distance at which parallaxes can no longer be measured 
D) Maximum brightness of a supernova 
A) Greatest mass a white dwarf can have 
B) Most massive main sequence star that can exist 
C) Distance at which parallaxes can no longer be measured 
D) Maximum brightness of a supernova

Question 12

A neutron star has a radius of about

Accepted Answer

A) 0.1km 
B) 10 km 
C) 1000 km 
D) 100,000 km 
A) 0.1km 
B) 10 km 
C) 1000 km 
D) 100,000 km

The Schwarzschild radius describes the size of a(n)

Which is not an end point of a star's evolutionary life?

Pulsars are

Suppose a star collapses and produces a black hole.The size of the event horizon of the black hole is determined entirely by the star's

The object at the center of the Crab Nebula is

Compared to low mass white dwarfs,massive white dwarfs are

What happens to the light from a star that has contracted within its event horizon?

The radius of the black hole that could be produced from the contraction of a star like the Sun would be about

According to general relativity,what effect does matter have on space?

A rotating neutron star is called a

The Chandrasekhar limit is the

A neutron star has a radius of about

Journeys Start

Patterns in the Sky

Ancient Astronomy

Renaissance Astronomy

Gravity and Motion

Light and Telescopes

Overview of the Solar System

The Earth

The Moon

Mercury and Venus

Mars

Jupiter and Saturn

The Outer Solar System

Satellites

Small Solar System Bodies

Basic Properties of Stars

The Sun

The Formation of Stars and Planets

The Evolution of Stars

Binary Star Systems

The Milky Way

Galaxies

Quasars and Other Active Galaxies

Galaxy Clusters and the Structure of the Universe

Cosmology

Life in the Universe

Filters

Exam 20: White Dwarfs, neutron Stars, and Black Holes

The Schwarzschild radius describes the size of a(n)

Which is not an end point of a star's evolutionary life?

Pulsars are

Suppose a star collapses and produces a black hole.The size of the event horizon of the black hole is determined entirely by the star's

The object at the center of the Crab Nebula is

Compared to low mass white dwarfs,massive white dwarfs are

What happens to the light from a star that has contracted within its event horizon?

The radius of the black hole that could be produced from the contraction of a star like the Sun would be about

According to general relativity,what effect does matter have on space?

A rotating neutron star is called a

The Chandrasekhar limit is the

A neutron star has a radius of about

Journeys Start

Patterns in the Sky

Ancient Astronomy

Renaissance Astronomy

Gravity and Motion

Light and Telescopes

Overview of the Solar System

The Earth

The Moon

Mercury and Venus

Mars

Jupiter and Saturn

The Outer Solar System

Satellites

Small Solar System Bodies

Basic Properties of Stars

The Sun

The Formation of Stars and Planets

The Evolution of Stars

Binary Star Systems

The Milky Way

Galaxies

Quasars and Other Active Galaxies

Galaxy Clusters and the Structure of the Universe

Cosmology

Life in the Universe

Filters