Question 1

A nanometer is

Accepted Answer

A)  a unit of frequency. 
B)  a unit of energy. 
C)  a unit of mass. 
D)  a unit of length. 
E)  a unit of resolving power. 
A)  a unit of frequency. 
B)  a unit of energy. 
C)  a unit of mass. 
D)  a unit of length. 
E)  a unit of resolving power.

Question 2

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

Accepted Answer

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

Question 3

Infrared space telescopes must have their mirror cooled to very low temperatures because otherwise it would thermally emit too much ____ itself.

Accepted Answer

A)  infrared radiation 
B)  radio waves 
C)  X-rays 
D)  gamma rays 
E)  all of the above 
A)  infrared radiation 
B)  radio waves 
C)  X-rays 
D)  gamma rays 
E)  all of the above

Question 4

Interferometry is easiest to use with telescopes that observe at very short wavelengths.

Accepted Answer

A) True 
 B)False

Question 5

The light-gathering power of a telescope is directly proportional to

Accepted Answer

A)  the diameter of the primary mirror or lens. 
B)  the focal length of the primary mirror or lens. 
C)  the ratio of the focal lengths of its primary mirror or lens and its eyepiece. 
D)  the length of the telescope tube. 
E)  the diameter of the eyepiece. 
A)  the diameter of the primary mirror or lens. 
B)  the focal length of the primary mirror or lens. 
C)  the ratio of the focal lengths of its primary mirror or lens and its eyepiece. 
D)  the length of the telescope tube. 
E)  the diameter of the eyepiece.

Question 6

A ____ is a piece of glass with many small parallel lines etched on its surface to produce a spectrum.

Accepted Answer

A)  grating 
B)  spectrograph 
C)  photometer 
D)  charge-coupled device 
E)  prism 
A)  grating 
B)  spectrograph 
C)  photometer 
D)  charge-coupled device 
E)  prism

Question 7

Which of the following types of electromagnetic radiation has the greatest energy?

Accepted Answer

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

Question 8

What is the wavelength of the longest wavelength light that can be seen with the human eye?

Accepted Answer

A)  400 nm 
B)  4000 nm 
C)  7000 nm 
D)  700 nm 
E)  3*108 m 
A)  400 nm 
B)  4000 nm 
C)  7000 nm 
D)  700 nm 
E)  3*108 m

Question 9

The light-gathering power of a telescope increases as the size of the objective increases.

Accepted Answer

A) True 
 B)False

Question 10

The ____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective.

Accepted Answer

A)  light-gathering power 
B)  focal length 
C)  magnifying power 
D)  resolving power 
E)  spherical aberration 
A)  light-gathering power 
B)  focal length 
C)  magnifying power 
D)  resolving power 
E)  spherical aberration

Question 11

Which of the following types of electromagnetic radiation has the smallest frequency?

Accepted Answer

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

Question 12

What is the magnification of a telescope and eyepiece if the telescope objective has a focal length of 200 cm and the eyepiece has a focal length of 2.0 cm?

Accepted Answer

A)  400 times 
B)  4000 times 
C)  100 times 
D)  1000 times 
E)  40 times 
A)  400 times 
B)  4000 times 
C)  100 times 
D)  1000 times 
E)  40 times

Question 13

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 14

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 15

The sidereal drive of a telescope mounting must turn the telescope

Accepted Answer

A)  southward about the polar axis. 
B)  eastward about the polar axis. 
C)  westward about the polar axis. 
D)  northward about the polar axis. 
E)  none of the above. 
A)  southward about the polar axis. 
B)  eastward about the polar axis. 
C)  westward about the polar axis. 
D)  northward about the polar axis. 
E)  none of the above.

Question 16

What causes chromatic aberration? Why does it not occur in reflecting telescopes?

Accepted Answer

The answer of What causes chromatic aberration? Why does it...

Question 17

The energy of a photon

Accepted Answer

A)  is proportional to the wavelength of the light. 
B)  is inversely proportional to the wavelength of the light. 
C)  depends only on the speed of the light. 
D)  depends only on the mass of the photon. 
E)  depends on both the mass and speed of the photon. 
A)  is proportional to the wavelength of the light. 
B)  is inversely proportional to the wavelength of the light. 
C)  depends only on the speed of the light. 
D)  depends only on the mass of the photon. 
E)  depends on both the mass and speed of the photon.

Question 18

How do electronic cameras resemble photographic plates? How do they differ?

Accepted Answer

The answer of How do electronic cameras resemble photographic plates?...

Question 19

Reflecting telescope objectives here on Earth do not have a problem with

Accepted Answer

A)  "seeing". 
B)  diffraction. 
C)  color fringes on the image. 
D)  all of the above. 
A)  "seeing". 
B)  diffraction. 
C)  color fringes on the image. 
D)  all of the above.

Question 20

Why can infrared telescopes operate from high flying aircraft and high mountain tops whereas X-ray telescopes must be placed in orbit?

Accepted Answer

The answer of Why can infrared telescopes operate from high...

A nanometer is

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

Infrared space telescopes must have their mirror cooled to very low temperatures because otherwise it would thermally emit too much ____ itself.

Interferometry is easiest to use with telescopes that observe at very short wavelengths.

The light-gathering power of a telescope is directly proportional to

A ____ is a piece of glass with many small parallel lines etched on its surface to produce a spectrum.

Which of the following types of electromagnetic radiation has the greatest energy?

What is the wavelength of the longest wavelength light that can be seen with the human eye?

The light-gathering power of a telescope increases as the size of the objective increases.

The ____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective.

Which of the following types of electromagnetic radiation has the smallest frequency?

What is the magnification of a telescope and eyepiece if the telescope objective has a focal length of 200 cm and the eyepiece has a focal length of 2.0 cm?

The resolving power of a telescope is

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

The sidereal drive of a telescope mounting must turn the telescope

What causes chromatic aberration? Why does it not occur in reflecting telescopes?

The energy of a photon

How do electronic cameras resemble photographic plates? How do they differ?

Reflecting telescope objectives here on Earth do not have a problem with

Why can infrared telescopes operate from high flying aircraft and high mountain tops whereas X-ray telescopes must be placed in orbit?

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

The Origin of the Solar System

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

A nanometer is

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

Infrared space telescopes must have their mirror cooled to very low temperatures because otherwise it would thermally emit too much ____ itself.

Interferometry is easiest to use with telescopes that observe at very short wavelengths.

The light-gathering power of a telescope is directly proportional to

A ____ is a piece of glass with many small parallel lines etched on its surface to produce a spectrum.

Which of the following types of electromagnetic radiation has the greatest energy?

What is the wavelength of the longest wavelength light that can be seen with the human eye?

The light-gathering power of a telescope increases as the size of the objective increases.

The ____ of a telescope is a measure of its ability to show fine detail and depends on the diameter of the objective.

Which of the following types of electromagnetic radiation has the smallest frequency?

What is the magnification of a telescope and eyepiece if the telescope objective has a focal length of 200 cm and the eyepiece has a focal length of 2.0 cm?

The resolving power of a telescope is

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

The sidereal drive of a telescope mounting must turn the telescope

What causes chromatic aberration? Why does it not occur in reflecting telescopes?

The energy of a photon

How do electronic cameras resemble photographic plates? How do they differ?

Reflecting telescope objectives here on Earth do not have a problem with

Why can infrared telescopes operate from high flying aircraft and high mountain tops whereas X-ray telescopes must be placed in orbit?

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

The Origin of the Solar System

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