Question 1

As a red giant star evolves, hydrogen shell burning proceeds increasingly faster due to:

Accepted Answer

A)  rotational energy from the star's rapid rotation 
B)  heat released from the core's contraction 
C)  pressure from the contracting envelope 
D)  release of energy stored in magnetic fields 
E)  energy from the fusion of heavier elements 
A)  rotational energy from the star's rapid rotation 
B)  heat released from the core's contraction 
C)  pressure from the contracting envelope 
D)  release of energy stored in magnetic fields 
E)  energy from the fusion of heavier elements

Question 2

What is the radius of a red giant star that has a luminosity of 300 L $\odot$ and a temperature of 4000 K? (Note that the temperature of the Sun is 5800 K.)

Accepted Answer

A)  8 R $\odot$ 
B)  13 R $\odot$ 
C)  25 R $\odot$ 
D)  36 R $\odot$ 
E)  65 R $\odot$ 
A)  8 R $\odot$ 
B)  13 R $\odot$ 
C)  25 R $\odot$ 
D)  36 R $\odot$ 
E)  65 R $\odot$

Question 3

Stars with masses similar to the Sun will lose approximately 30 percent of their mass before they become white dwarfs.

Accepted Answer

A) True 
 B)False

Question 4

The Sun will likely stop being a main-sequence star in:

Accepted Answer

A)  5,000 years 
B)  5 million years 
C)  50 million years 
D)  500 million years 
E)  5 billion years 
A)  5,000 years 
B)  5 million years 
C)  50 million years 
D)  500 million years 
E)  5 billion years

Question 5

Use the following graph and the relationship  $ \tau $ $\infty$M/L to estimate the main-sequence lifetime of a star with a mass equal to 10 times that of the Sun. Note that the Sun's main-sequence lifetime is about 1010 years.

Accepted Answer

A)  3 million years 
B)  30 million years 
C)  300 million years 
D)  3 billion years 
E)  30 billion years 
A)  3 million years 
B)  30 million years 
C)  300 million years 
D)  3 billion years 
E)  30 billion years

Question 6

Helium burns in the core of a horizontal branch star via _________ and produces _________.

Accepted Answer

A)  the triple-alpha reaction; carbon 
B)  the proton-proton chain; lithium 
C)  the triple-alpha reaction; oxygen 
D)  the proton-proton chain; iron 
E)  the proton-proton chain; calcium 
A)  the triple-alpha reaction; carbon 
B)  the proton-proton chain; lithium 
C)  the triple-alpha reaction; oxygen 
D)  the proton-proton chain; iron 
E)  the proton-proton chain; calcium

Question 7

A star like the Sun will eventually become an electron degenerate white dwarf star.

Accepted Answer

A) True 
 B)False

Question 8

What is a planetary nebula?

Accepted Answer

A)  a planet surrounded by a glowing shell of gas 
B)  the disk of gas and dust surrounding a young star that will soon form a star system 
C)  the ejected envelope of a giant star surrounding the remnant of a star 
D)  a type of young, medium-mass star 
E)  leftover gas from a supernova explosion 
A)  a planet surrounded by a glowing shell of gas 
B)  the disk of gas and dust surrounding a young star that will soon form a star system 
C)  the ejected envelope of a giant star surrounding the remnant of a star 
D)  a type of young, medium-mass star 
E)  leftover gas from a supernova explosion

Question 9

The Sun will become a red giant star in about 5 billion years.

Accepted Answer

A) True 
 B)False

Question 10

A 1M $\odot$  star in a binary system could create the following chemical element and eject it into the interstellar medium:

Accepted Answer

A)  carbon 
B)  helium 
C)  iron 
D)  gold 
E)  all of the above 
A)  carbon 
B)  helium 
C)  iron 
D)  gold 
E)  all of the above

As a red giant star evolves, hydrogen shell burning proceeds increasingly faster due to:

What is the radius of a red giant star that has a luminosity of 300 L _$\odot$ and a temperature of 4000 K? (Note that the temperature of the Sun is 5800 K.)

Stars with masses similar to the Sun will lose approximately 30 percent of their mass before they become white dwarfs.

The Sun will likely stop being a main-sequence star in:

Helium burns in the core of a horizontal branch star via _ and produces _.

A star like the Sun will eventually become an electron degenerate white dwarf star.

What is a planetary nebula?

The Sun will become a red giant star in about 5 billion years.

A 1M _$\odot$ star in a binary system could create the following chemical element and eject it into the interstellar medium:

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

Exam 16: Evolution of Low-Mass Stars

As a red giant star evolves, hydrogen shell burning proceeds increasingly faster due to:

What is the radius of a red giant star that has a luminosity of 300 L ⊙\odot⊙ and a temperature of 4000 K? (Note that the temperature of the Sun is 5800 K.)

Stars with masses similar to the Sun will lose approximately 30 percent of their mass before they become white dwarfs.

The Sun will likely stop being a main-sequence star in:

Use the following graph and the relationship τ \tau τ ∞\infty∞ M/L to estimate the main-sequence lifetime of a star with a mass equal to 10 times that of the Sun. Note that the Sun's main-sequence lifetime is about 1010 years.

Helium burns in the core of a horizontal branch star via _________ and produces _________.

A star like the Sun will eventually become an electron degenerate white dwarf star.

What is a planetary nebula?

The Sun will become a red giant star in about 5 billion years.

A 1M ⊙\odot⊙ star in a binary system could create the following chemical element and eject it into the interstellar medium:

Why Learn Astronomy

Patterns in the Skymotions of Earth

Motion of Astronomical Bodies

Gravity and Orbits

Light

The Tools of the Astronomer

The Birth and Evolution of Planetary Systems

The Terrestrial Planets and Earths Moon

Atmospheres of the Terrestrial Planets

Worlds of Gas and Liquid the Giant Planets

Planetary Adornmentsmoons and Rings

Dwarf Planets and Small Solar System Bodies

Taking the Measure of Stars

Our Starthe Sun

Star Formation and the Interstellar Medium

Evolution of High-Mass Stars

Relativity and Black Holes

The Expanding Universe

Galaxies

The Milky Waya Normal Spiral Galaxy

Modern Cosmology

Large-Scale Structure in the Universe

Life

Filters

What is the radius of a red giant star that has a luminosity of 300 L _$\odot$ and a temperature of 4000 K? (Note that the temperature of the Sun is 5800 K.)

Helium burns in the core of a horizontal branch star via _ and produces _.

A 1M _$\odot$ star in a binary system could create the following chemical element and eject it into the interstellar medium: