Question 1

Uranus is 20 times farther from the Sun than is the Earth.How many times brighter does the Sun appear from Earth than from Uranus?

Accepted Answer

A) 20 times 
B) 400 times 
C) 40 times 
D) 8000 times 
A) 20 times 
B) 400 times 
C) 40 times 
D) 8000 times B

Question 2

The astronomical unit is a unit used to describe

Accepted Answer

A) Masses 
B) Periods of revolution 
C) Distances 
D) Acclerations 
A) Masses 
B) Periods of revolution 
C) Distances 
D) Acclerations C

Question 3

The half-life of a particular isotope of potassium is 1.3 billion years.After 2.6 billion years,how much of the original amount of that isotope remains?

Accepted Answer

A) Half 
B) None 
C) One-fourth 
D) All of it 
A) Half 
B) None 
C) One-fourth 
D) All of it C

Question 4

Which of the following is not a terrestrial planet?

Accepted Answer

A) Neptune 
B) Mercury 
C) Mars 
D) Venus 
A) Neptune 
B) Mercury 
C) Mars 
D) Venus

Question 5

A planet has an albedo of 0.6.What percentage of the sunlight that strikes the planet is absorbed by the planet?

Accepted Answer

A) 60% 
B) 40% 
C) 100% 
D) Cannot be calculated from the information given 
A) 60% 
B) 40% 
C) 100% 
D) Cannot be calculated from the information given

Question 6

Suppose a blackbody is brightest at a wavelength of one micron.If the temperature of the blackbody is halved,at what wavelength would it be brightest?

Accepted Answer

A) 2 microns 
B) 1 micron 
C) 0.5 microns 
D) 4 microns 
A) 2 microns 
B) 1 micron 
C) 0.5 microns 
D) 4 microns

Question 7

How does the brightness of an object vary with distance from the object?

Accepted Answer

A) It remains constant with varying distance 
B) It varies as the inverse of distance 
C) It decreases as the square of distance 
D) It decreases as the cube of distance 
A) It remains constant with varying distance 
B) It varies as the inverse of distance 
C) It decreases as the square of distance 
D) It decreases as the cube of distance

Question 8

The Sun has a temperature of 6000 K and is brightest at a wavelength of about 5000 Å.What is the temperature of a star that is brightest at a wavelength of about 10,000 Å?

Accepted Answer

A) 3000 K 
B) 8000 K 
C) 10,000 K 
D) 12,000 K 
A) 3000 K 
B) 8000 K 
C) 10,000 K 
D) 12,000 K

Question 9

Which of the following planets is least likely to retain a thick atmosphere?

Accepted Answer

A) A planet with a hot atmosphere,low gravity 
B) A planet with a hot atmosphere,high gravity 
C) A planet with a cool atmosphere,low gravity 
D) A planet with a cool atmosphere,high gravity 
A) A planet with a hot atmosphere,low gravity 
B) A planet with a hot atmosphere,high gravity 
C) A planet with a cool atmosphere,low gravity 
D) A planet with a cool atmosphere,high gravity

Question 10

The orbits of the planets are all

Accepted Answer

A) Randomly oriented in space 
B) Circular 
C) Larger than the orbit of the Earth 
D) Prograde (counterclockwise motion as viewed from the north) 
E) Perpendicular to the orbit of the Earth 
A) Randomly oriented in space 
B) Circular 
C) Larger than the orbit of the Earth 
D) Prograde (counterclockwise motion as viewed from the north) 
E) Perpendicular to the orbit of the Earth

Question 11

If you double the temperature of a black body,the radiation rate will increase by what factor?

Accepted Answer

A) 2 
B) 4 
C) 8 
D) 16 
A) 2 
B) 4 
C) 8 
D) 16

Question 12

If an object emits blackbody radiation there is a unique correspondence between the

Accepted Answer

A) Temperature of the object and the wavelength at which it is brightest 
B) Temperature of an object and its surface area 
C) Mass of the object and its surface temperature 
D) Color of the body and its surface area 
A) Temperature of the object and the wavelength at which it is brightest 
B) Temperature of an object and its surface area 
C) Mass of the object and its surface temperature 
D) Color of the body and its surface area

Question 13

Which of the following sets of planets has locations in the inner solar system,relatively small diameters,and high densities?

Accepted Answer

A) Mercury,Venus,Earth,Mars 
B) Earth,Mars,Jupiter,Saturn 
C) Jupiter,Saturn,Uranus,Neptune 
D) Mercury,Venus,Uranus,Neptune 
A) Mercury,Venus,Earth,Mars 
B) Earth,Mars,Jupiter,Saturn 
C) Jupiter,Saturn,Uranus,Neptune 
D) Mercury,Venus,Uranus,Neptune

Question 14

What is the relationship between radiation rate and temperature for a black body?

Accepted Answer

A) Proportional to the temperature 
B) Inversely proportional to the temperature 
C) Proportional to the square of the temperature 
D) Proportional to the fourth power of the temperature 
A) Proportional to the temperature 
B) Inversely proportional to the temperature 
C) Proportional to the square of the temperature 
D) Proportional to the fourth power of the temperature

Question 15

Which of the following planets is most likely to retain hydrogen in its atmosphere? Assume all of the planets are equally distant from the Sun

Accepted Answer

A) A planet with large mass,large radius 
B) A planet with large mass,small radius 
C) A planet with small mass,large radius 
D) A planet with small mass,small radius 
A) A planet with large mass,large radius 
B) A planet with large mass,small radius 
C) A planet with small mass,large radius 
D) A planet with small mass,small radius

Question 16

Mercury is 50% farther from the Sun when it is at aphelion than when it is at perihelion.How many times more intense is sunlight on Mercury at perihelion than at aphelion?

Accepted Answer

A) 1.5 times 
B) 2.25 times 
C) 5.0 times 
D) 3.0 times 
A) 1.5 times 
B) 2.25 times 
C) 5.0 times 
D) 3.0 times

Question 17

An astronomical unit is the

Accepted Answer

A) Average distance between the Sun and Earth 
B) Distance between the Earth and the Moon 
C) Angular size of the Sun 
D) Distance between the Sun and the nearest star 
A) Average distance between the Sun and Earth 
B) Distance between the Earth and the Moon 
C) Angular size of the Sun 
D) Distance between the Sun and the nearest star

Question 18

More than 99% of the mass of the solar system is contained in

Accepted Answer

A) The Earth 
B) The Sun 
C) The giant planets 
D) Jupiter 
A) The Earth 
B) The Sun 
C) The giant planets 
D) Jupiter

Question 19

Mercury is 0.4 AU from the Sun.How does the flux of sunlight for Mercury compare to the flux of sunlight for the Earth?

Accepted Answer

A) Earth's is 2.5 times as large 
B) Mercury's is 2.5 times as large 
C) Earth's is 6.25 times as large. 
D) Mercury's is 6.25 times as large 
A) Earth's is 2.5 times as large 
B) Mercury's is 2.5 times as large 
C) Earth's is 6.25 times as large. 
D) Mercury's is 6.25 times as large

Question 20

Suppose there are 1000 grams of an isotope that has a half-life of 10 minutes.How much of the isotope will be left after 40 minutes?

Accepted Answer

A) 250 grams 
B) 0 grams 
C) 125 grams 
D) 62.5 grams 
A) 250 grams 
B) 0 grams 
C) 125 grams 
D) 62.5 grams

Exam 7: Overview of the Solar System

Uranus is 20 times farther from the Sun than is the Earth.How many times brighter does the Sun appear from Earth than from Uranus?

The astronomical unit is a unit used to describe

The half-life of a particular isotope of potassium is 1.3 billion years.After 2.6 billion years,how much of the original amount of that isotope remains?

Which of the following is not a terrestrial planet?

A planet has an albedo of 0.6.What percentage of the sunlight that strikes the planet is absorbed by the planet?

Suppose a blackbody is brightest at a wavelength of one micron.If the temperature of the blackbody is halved,at what wavelength would it be brightest?

How does the brightness of an object vary with distance from the object?

The Sun has a temperature of 6000 K and is brightest at a wavelength of about 5000 Å.What is the temperature of a star that is brightest at a wavelength of about 10,000 Å?

Which of the following planets is least likely to retain a thick atmosphere?

The orbits of the planets are all

If you double the temperature of a black body,the radiation rate will increase by what factor?

If an object emits blackbody radiation there is a unique correspondence between the

Which of the following sets of planets has locations in the inner solar system,relatively small diameters,and high densities?

What is the relationship between radiation rate and temperature for a black body?

Which of the following planets is most likely to retain hydrogen in its atmosphere? Assume all of the planets are equally distant from the Sun

Mercury is 50% farther from the Sun when it is at aphelion than when it is at perihelion.How many times more intense is sunlight on Mercury at perihelion than at aphelion?

An astronomical unit is the

More than 99% of the mass of the solar system is contained in

Mercury is 0.4 AU from the Sun.How does the flux of sunlight for Mercury compare to the flux of sunlight for the Earth?

Suppose there are 1000 grams of an isotope that has a half-life of 10 minutes.How much of the isotope will be left after 40 minutes?

Journeys Start

Patterns in the Sky

Ancient Astronomy

Renaissance Astronomy

Gravity and Motion

Light and Telescopes

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

White Dwarfs, neutron Stars, and Black Holes

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

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