Question 1

Compared to a smaller-objective lens, a larger-objective lens makes a star's image

Accepted Answer

A)  brighter. 
B)  dimmer. 
C)  no effect. 
A)  brighter. 
B)  dimmer. 
C)  no effect.

Question 2

Explain why the majority of large modern telescopes are not refractors.

Accepted Answer

Refracting telescopes suffer from chroma

Question 3

A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes

Accepted Answer

A)  use segmented mirrors. 
B)  use mirrors that are very thin. 
C)  use active optics to control the shape of the mirror. 
D)  All of the other choices are correct. 
E)  None of the other choices are correct. 
A)  use segmented mirrors. 
B)  use mirrors that are very thin. 
C)  use active optics to control the shape of the mirror. 
D)  All of the other choices are correct. 
E)  None of the other choices are correct.

Question 4

The resolving power of a telescope is

Accepted Answer

A)  a measure of the minimum angular separation that can be seen with the telescope. 
B)  a measure of the maximum angular separation that can be seen with the telescope. 
C)  a measure of the amount of light that the telescope can gather in one second. 
D)  the separation between the objective and the image. 
E)  a measure of how blurry object appear in the telescope. 
A)  a measure of the minimum angular separation that can be seen with the telescope. 
B)  a measure of the maximum angular separation that can be seen with the telescope. 
C)  a measure of the amount of light that the telescope can gather in one second. 
D)  the separation between the objective and the image. 
E)  a measure of how blurry object appear in the telescope.

Question 5

Light rays from a distant source __________________, assuming the light does not pass through any cloud-like nebulae.

Accepted Answer

A)  are perpendicular 
B)  focus to an image 
C)  focus to a point 
D)  are parallel 
A)  are perpendicular 
B)  focus to an image 
C)  focus to a point 
D)  are parallel

Question 6

The main reason for positioning many radio telescopes across a large area and combining the signals is

Accepted Answer

A)  to observe more objects in a shorter amount of time. 
B)  provide a backup system if one or more of the telescopes go down. 
C)  to produce higher resolution images. 
D)  to avoid interference between signals from the separate telescopes. 
E)  to account for the motion of objects in the sky as a result of the Earth's rotation. 
A)  to observe more objects in a shorter amount of time. 
B)  provide a backup system if one or more of the telescopes go down. 
C)  to produce higher resolution images. 
D)  to avoid interference between signals from the separate telescopes. 
E)  to account for the motion of objects in the sky as a result of the Earth's rotation.

Question 7

The ____________________ is a measure of the clarity of the atmosphere.

Accepted Answer

The answer of The ____________________ is a measure of the...

Question 8

CCD stands for a

Accepted Answer

A)  photometer. 
B)  charge-coupled device. 
C)  spectrograph. 
D)  core collapse device. 
E)  grating. 
A)  photometer. 
B)  charge-coupled device. 
C)  spectrograph. 
D)  core collapse device. 
E)  grating.

Question 9

All radio telescopes are refracting telescopes.

Accepted Answer

A) True 
 B)False

Question 10

Ultraviolet radiation from a star

Accepted Answer

A)  will not penetrate Earth's atmosphere and reach the ground. 
B)  has a wavelength that is longer than the visible light emitted by the star. 
C)  has a wavelength that is shorter than the X-rays emitted by the star. 
D)  will not penetrate Earth's atmosphere and reach the ground and has a wavelength that is longer than the visible light emitted by the star. 
E)  has a wavelength that is longer than the visible light emitted by the star and has a wavelength that is shorter than the X-rays emitted by the star. 
A)  will not penetrate Earth's atmosphere and reach the ground. 
B)  has a wavelength that is longer than the visible light emitted by the star. 
C)  has a wavelength that is shorter than the X-rays emitted by the star. 
D)  will not penetrate Earth's atmosphere and reach the ground and has a wavelength that is longer than the visible light emitted by the star. 
E)  has a wavelength that is longer than the visible light emitted by the star and has a wavelength that is shorter than the X-rays emitted by the star.

Question 11

Which of the waves below has the shortest wavelength?

Accepted Answer

A)  gamma rays 
B)  X-rays 
C)  visible light 
D)  infrared 
E)  radio 
A)  gamma rays 
B)  X-rays 
C)  visible light 
D)  infrared 
E)  radio

Question 12

What is the wavelength of light that has a frequency of 3 MHz?

Accepted Answer

A)  9 × 1014 Hz 
B)  1 × 1014 m 
C)  9 × 1014 m 
D)  100 m 
E)  0.01 m 
A)  9 × 1014 Hz 
B)  1 × 1014 m 
C)  9 × 1014 m 
D)  100 m 
E)  0.01 m

Question 13

__________ in Earth's atmosphere absorbs most microwave and infrared radiation coming from outside Earth's atmosphere.

Accepted Answer

A)  Ozone 
B)  Water vapor 
C)  Methane 
D)  Carbon dioxide 
A)  Ozone 
B)  Water vapor 
C)  Methane 
D)  Carbon dioxide

Question 14

Both optical and radio telescopes can suffer from light pollution.

Accepted Answer

A) True 
 B)False

Question 15

Interferometry connects two or more separate telescopes only in the optical band of the electromagnetic spectrum.

Accepted Answer

A) True 
 B)False

Question 16

What is the frequency of the shortest wavelength light that can be detected by the average human eye?

Accepted Answer

A)  0.0025 Hz 
B)  7.5 × 1014 Hz 
C)  3.0 × 108 m/s 
D)  700 nm 
E)  400 nm 
A)  0.0025 Hz 
B)  7.5 × 1014 Hz 
C)  3.0 × 108 m/s 
D)  700 nm 
E)  400 nm

Question 17

List the advantages the Hubble Space Telescope has over ground-based telescopes.

Accepted Answer

The HST is not limited to the atmospheri

Question 18

Which of the following features of a telescope determines its light-gathering power?

Accepted Answer

A)  the focal length of the primary lens 
B)  the focal length of the eyepiece 
C)  the diameter of the primary lens 
D)  length of the telescope tube 
E)  None of the other choices are correct. 
A)  the focal length of the primary lens 
B)  the focal length of the eyepiece 
C)  the diameter of the primary lens 
D)  length of the telescope tube 
E)  None of the other choices are correct.

Question 19

Radio telescopes have poor resolving power because

Accepted Answer

A)  their diameters are so large. 
B)  the energy they receive is not electromagnetic radiation. 
C)  radio waves have long wavelengths. 
D)  their diameters are so large and the energy they receive is not electromagnetic radiation. 
E)  None of the other choices are correct. 
A)  their diameters are so large. 
B)  the energy they receive is not electromagnetic radiation. 
C)  radio waves have long wavelengths. 
D)  their diameters are so large and the energy they receive is not electromagnetic radiation. 
E)  None of the other choices are correct.

Question 20

Photographic plates are commonly used by astronomers today.

Accepted Answer

A) True 
 B)False

Compared to a smaller-objective lens, a larger-objective lens makes a star's image

Explain why the majority of large modern telescopes are not refractors.

A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes

The resolving power of a telescope is

Light rays from a distant source __________________, assuming the light does not pass through any cloud-like nebulae.

The main reason for positioning many radio telescopes across a large area and combining the signals is

The ____________________ is a measure of the clarity of the atmosphere.

CCD stands for a

All radio telescopes are refracting telescopes.

Ultraviolet radiation from a star

Which of the waves below has the shortest wavelength?

What is the wavelength of light that has a frequency of 3 MHz?

__________ in Earth's atmosphere absorbs most microwave and infrared radiation coming from outside Earth's atmosphere.

Both optical and radio telescopes can suffer from light pollution.

Interferometry connects two or more separate telescopes only in the optical band of the electromagnetic spectrum.

What is the frequency of the shortest wavelength light that can be detected by the average human eye?

List the advantages the Hubble Space Telescope has over ground-based telescopes.

Which of the following features of a telescope determines its light-gathering power?

Radio telescopes have poor resolving power because

Photographic plates are commonly used by astronomers today.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters

Exam 5: Light and Telescopes

Compared to a smaller-objective lens, a larger-objective lens makes a star's image

Explain why the majority of large modern telescopes are not refractors.

A new generation of ground-based telescopes is currently being built that overcomes the limitations of the older large telescopes. Some of these new telescopes

The resolving power of a telescope is

Light rays from a distant source __________________, assuming the light does not pass through any cloud-like nebulae.

The main reason for positioning many radio telescopes across a large area and combining the signals is

The ____________________ is a measure of the clarity of the atmosphere.

CCD stands for a

All radio telescopes are refracting telescopes.

Ultraviolet radiation from a star

Which of the waves below has the shortest wavelength?

What is the wavelength of light that has a frequency of 3 MHz?

__________ in Earth's atmosphere absorbs most microwave and infrared radiation coming from outside Earth's atmosphere.

Both optical and radio telescopes can suffer from light pollution.

Interferometry connects two or more separate telescopes only in the optical band of the electromagnetic spectrum.

What is the frequency of the shortest wavelength light that can be detected by the average human eye?

List the advantages the Hubble Space Telescope has over ground-based telescopes.

Which of the following features of a telescope determines its light-gathering power?

Radio telescopes have poor resolving power because

Photographic plates are commonly used by astronomers today.

Here and Now

A Users Guide to the Sky

Cycles of the Sun and Moon

The Origin of Modern Astronomy

Atoms and Spectra

The Sun

The Family of Stars

The Formation and Structure of Stars

The Deaths of Stars

Neutron Stars and Black Holes

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Origin of the Solar System and Extrasolar Planets

Earth and Moon: Bases for Comparative Planetology

Mercury, Venus, and Mars

The Outer Solar System

Meteorites, Asteroids, and Comets

Astrobiology: Life on Other Worlds

Filters