Question 1

The spectrum of light from a hot,rarefied gas

Accepted Answer

A) Has a continuous spectrum 
B) Shows bright emission lines,at wavelengths that differ for each element 
C) Shows bright emission lines,at the same wavelengths for all elements 
D) Shows dark absorption lines 
A) Has a continuous spectrum 
B) Shows bright emission lines,at wavelengths that differ for each element 
C) Shows bright emission lines,at the same wavelengths for all elements 
D) Shows dark absorption lines B

Question 2

Stars of different spectral classes,O,B,A,F,G,K,M,show differences in the strengths of absorption lines of various elements.These differences are due to differences in

Accepted Answer

A) The chemical compositions of stars 
B) The surface temperatures of stars 
C) Stellar distances 
D) Stellar ages 
A) The chemical compositions of stars 
B) The surface temperatures of stars 
C) Stellar distances 
D) Stellar ages B

Question 3

Two stars,which differ in magnitude by 5,have a brightness ratio of

Accepted Answer

A) 5:1 
B) 10:1 
C) 50:1 
D) 100:1 
A) 5:1 
B) 10:1 
C) 50:1 
D) 100:1 D

Question 4

Which of the following processes will result in the emission of a photon?

Accepted Answer

A) The electron in an atom jumping to a higher energy level 
B) The electron in an atom jumping to a lower energy level 
C) An atom becoming ionized 
D) The electron in an atom remaining in the ground state 
A) The electron in an atom jumping to a higher energy level 
B) The electron in an atom jumping to a lower energy level 
C) An atom becoming ionized 
D) The electron in an atom remaining in the ground state

Question 5

What spectral class is just hotter than spectral class F?

Accepted Answer

A) O 
B) B 
C) A 
D) K 
A) O 
B) B 
C) A 
D) K

Question 6

When an electron of an atom moves to a higher energy state,the atom is said to be

Accepted Answer

A) Ionized 
B) Excited 
C) Electronized 
D) Suspended 
A) Ionized 
B) Excited 
C) Electronized 
D) Suspended

Question 7

If two stars differ in magnitude by 15 magnitudes,what is the ratio of their brightnesses?

Accepted Answer

A) 15:1 
B) 300:1 
C) 1000:1 
D) 1,000,000:1 
A) 15:1 
B) 300:1 
C) 1000:1 
D) 1,000,000:1

Question 8

The apparent magnitudes of stars A and B are 5.5 and 10.5 respectively.Which of the following is true ?

Accepted Answer

A) Star A appears 5 times brighter than star B 
B) Star A appears 5 times dimmer than star B 
C) Star A appears 100 times brighter than star B 
D) Star A appears 100 times dimmer than star B 
E) Star A is intrinsically 5.5 times dimmer than star B 
A) Star A appears 5 times brighter than star B 
B) Star A appears 5 times dimmer than star B 
C) Star A appears 100 times brighter than star B 
D) Star A appears 100 times dimmer than star B 
E) Star A is intrinsically 5.5 times dimmer than star B

Question 9

Star A has 4 times the radius of star B and is twice as hot.How does the luminosity of star A compare to that of star B?

Accepted Answer

A) 8 times as great 
B) 1024 times as great 
C) 16 times as great 
D) 256 times as great 
A) 8 times as great 
B) 1024 times as great 
C) 16 times as great 
D) 256 times as great

Question 10

Which of the following correctly describes the relative distances of the stars and planets? The stars are

Accepted Answer

A) About 10 times farther away than the nearest planets 
B) About 100 times farther away than the nearest planets 
C) About 100,000 times farther away than the nearest planets 
D) Several billion times farther away than the nearest planets 
A) About 10 times farther away than the nearest planets 
B) About 100 times farther away than the nearest planets 
C) About 100,000 times farther away than the nearest planets 
D) Several billion times farther away than the nearest planets

Question 11

Suppose you are an astronomer on Jupiter (distance to the Sun = 5 AU).You observe a star with a parallax of 0.1 arcseconds.What is the star's distance?

Accepted Answer

A) 0.1 pc 
B) 2 pc 
C) 5 pc 
D) 50 pc 
A) 0.1 pc 
B) 2 pc 
C) 5 pc 
D) 50 pc

Question 12

Two stars differ by 10 in absolute magnitude.What is the ratio of their luminosities?

Accepted Answer

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

Question 13

A star is observed to have extremely strong lines of hydrogen,very weak neutral helium,and weak neutral metals.The spectral type of such a star is closest to

Accepted Answer

A) O5 
B) B2 
C) A0 
D) K5 
E) M8 
A) O5 
B) B2 
C) A0 
D) K5 
E) M8

Question 14

A globular cluster is 1 kiloparsec away.What is its parallax?

Accepted Answer

A) .001 seconds of arc 
B) 1 second of arc 
C) 1000 seconds of arc 
D) 0.1 seconds of arc 
A) .001 seconds of arc 
B) 1 second of arc 
C) 1000 seconds of arc 
D) 0.1 seconds of arc

Question 15

On a certain date,Mars has an apparent magnitude of +1 and Venus has an apparent magnitude of +2.Which is brighter and by how much?

Accepted Answer

A) Venus is twice as bright as Mars 
B) Venus is 2.5 times as bright as Mars 
C) Mars is twice as bright as Venus 
D) Mars is 2.5 times as bright as Venus 
E) Mars is 100 times as bright as Venus 
A) Venus is twice as bright as Mars 
B) Venus is 2.5 times as bright as Mars 
C) Mars is twice as bright as Venus 
D) Mars is 2.5 times as bright as Venus 
E) Mars is 100 times as bright as Venus

Question 16

How distant is a star with a parallax of 0.05 arcseconds?

Accepted Answer

A) 0.05 parsecs 
B) 0.2 parsecs 
C) 2 parsecs 
D) 20 parsecs 
A) 0.05 parsecs 
B) 0.2 parsecs 
C) 2 parsecs 
D) 20 parsecs

Question 17

The absolute magnitude of a star is a measure of its

Accepted Answer

A) Distance 
B) Temperature 
C) Mass 
D) Luminosity 
A) Distance 
B) Temperature 
C) Mass 
D) Luminosity

Question 18

How much fainter is a twelfth magnitude star than an eighth magnitude star?

Accepted Answer

A) 4 times 
B) 10 times 
C) 40 times 
D) 2.5 times 
A) 4 times 
B) 10 times 
C) 40 times 
D) 2.5 times

Question 19

An H-R diagram for a group of stars cannot be produced by plotting their

Accepted Answer

A) Luminosities versus masses 
B) Magnitudes versus spectral types 
C) Temperatures versus luminosities 
D) Colors versus magnitudes 
A) Luminosities versus masses 
B) Magnitudes versus spectral types 
C) Temperatures versus luminosities 
D) Colors versus magnitudes

Question 20

How does the brightness of a fourth magnitude star compare with that of a ninth magnitude star?

Accepted Answer

A) It is 5 times brighter 
B) It is 5 times fainter 
C) It is 100 times brighter 
D) It is 100 times fainter 
A) It is 5 times brighter 
B) It is 5 times fainter 
C) It is 100 times brighter 
D) It is 100 times fainter

Exam 16: Basic Properties of Stars

The spectrum of light from a hot,rarefied gas

Stars of different spectral classes,O,B,A,F,G,K,M,show differences in the strengths of absorption lines of various elements.These differences are due to differences in

Two stars,which differ in magnitude by 5,have a brightness ratio of

Which of the following processes will result in the emission of a photon?

What spectral class is just hotter than spectral class F?

When an electron of an atom moves to a higher energy state,the atom is said to be

If two stars differ in magnitude by 15 magnitudes,what is the ratio of their brightnesses?

The apparent magnitudes of stars A and B are 5.5 and 10.5 respectively.Which of the following is true ?

Star A has 4 times the radius of star B and is twice as hot.How does the luminosity of star A compare to that of star B?

Which of the following correctly describes the relative distances of the stars and planets? The stars are

Suppose you are an astronomer on Jupiter (distance to the Sun = 5 AU).You observe a star with a parallax of 0.1 arcseconds.What is the star's distance?

Two stars differ by 10 in absolute magnitude.What is the ratio of their luminosities?

A star is observed to have extremely strong lines of hydrogen,very weak neutral helium,and weak neutral metals.The spectral type of such a star is closest to

A globular cluster is 1 kiloparsec away.What is its parallax?

On a certain date,Mars has an apparent magnitude of +1 and Venus has an apparent magnitude of +2.Which is brighter and by how much?

How distant is a star with a parallax of 0.05 arcseconds?

The absolute magnitude of a star is a measure of its

How much fainter is a twelfth magnitude star than an eighth magnitude star?

An H-R diagram for a group of stars cannot be produced by plotting their

How does the brightness of a fourth magnitude star compare with that of a ninth magnitude star?

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

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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