Question 1

Photons of blue light

Accepted Answer

A)  have a greater energy than photons of red light. 
B)  have a greater energy than photons of ultraviolet light. 
C)  have a lower frequency than photons of red light. 
D)  have a longer wavelength than photons of red light. 
E)  travel at a greater speed than photons of red light. 
A)  have a greater energy than photons of red light. 
B)  have a greater energy than photons of ultraviolet light. 
C)  have a lower frequency than photons of red light. 
D)  have a longer wavelength than photons of red light. 
E)  travel at a greater speed than photons of red light.

Question 2

The amount of energy a photon carries depends on its wavelength.

Accepted Answer

A) True 
 B)False

Question 3

What is the ratio of the light gathering power of a 10 m telescope to that of a 1 m telescope?

Accepted Answer

A)  10 to 1 
B)  1 to 10 
C)  100 to 1 
D)  1 to 100 
E)  3.2 to 1 
A)  10 to 1 
B)  1 to 10 
C)  100 to 1 
D)  1 to 100 
E)  3.2 to 1

Question 4

Astronomers build telescopes on tops of mountains because

Accepted Answer

A)  there is less air to dim the light. 
B)  the seeing is better. 
C)  CCDs work better when there is less oxygen in the air. 
D)  all of the above 
E)  a and b 
A)  there is less air to dim the light. 
B)  the seeing is better. 
C)  CCDs work better when there is less oxygen in the air. 
D)  all of the above 
E)  a and b

Question 5

Chromatic aberration occurs in a ____ telescope when ____.

Accepted Answer

A)  reflecting; different colors of light do not focus at the same point. 
B)  refracting; different colors of light do not focus at the same point. 
C)  reflecting; light of different wavelengths get absorbed by the mirror. 
D)  refracting; light of different wavelengths get absorbed by the lens. 
A)  reflecting; different colors of light do not focus at the same point. 
B)  refracting; different colors of light do not focus at the same point. 
C)  reflecting; light of different wavelengths get absorbed by the mirror. 
D)  refracting; light of different wavelengths get absorbed by the lens.

Question 6

In a reflecting telescope, the objective is a mirror.

Accepted Answer

A) True 
 B)False

Question 7

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 8

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 9

A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?

Accepted Answer

The answer of A wave on a lake is found...

Question 10

Long wavelength visible light

Accepted Answer

A)  will have a greater energy than short wavelength visible light. 
B)  will have a speed that is faster than short wavelength light. 
C)  has a higher frequency than short wavelength visible light. 
D)  will appear blue in color to the average human eye. 
E)  will appear red in color to the average human eye. 
A)  will have a greater energy than short wavelength visible light. 
B)  will have a speed that is faster than short wavelength light. 
C)  has a higher frequency than short wavelength visible light. 
D)  will appear blue in color to the average human eye. 
E)  will appear red in color to the average human eye.

Question 11

The sidereal drive on a telescope mounting must turn the telescope eastward about the polar axis.

Accepted Answer

A) True 
 B)False

Question 12

A ____ has a few million light sensitive diodes in an array typically about a half-inch square.

Accepted Answer

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

Question 13

What are sources of light pollution and how do those affects astronomical observations?

Accepted Answer

Sources of light pollution include artif

Question 14

Radio telescopes are important in astronomy because

Accepted Answer

A)  they can detect cool hydrogen. 
B)  they have high magnification. 
C)  the can detect interstellar dust clouds. 
D)  they are very inexpensive to build on tops of mountains. 
E)  they don t need to be as large as optical telescopes to achieve the same resolving power. 
A)  they can detect cool hydrogen. 
B)  they have high magnification. 
C)  the can detect interstellar dust clouds. 
D)  they are very inexpensive to build on tops of mountains. 
E)  they don t need to be as large as optical telescopes to achieve the same resolving power.

Question 15

Which has the larger light-gathering power?

Accepted Answer

A)  A telescope of 5 cm diameter and focal length of 50 cm. 
B)  A telescope of 6 cm diameter and focal length of 100 cm. 
C)  A telescope of 2 cm diameter and focal length of 100 cm. 
D)  A telescope of 3 cm diameter and focal length of 75 cm. 
E)  Both b and c since they have the same focal length. 
A)  A telescope of 5 cm diameter and focal length of 50 cm. 
B)  A telescope of 6 cm diameter and focal length of 100 cm. 
C)  A telescope of 2 cm diameter and focal length of 100 cm. 
D)  A telescope of 3 cm diameter and focal length of 75 cm. 
E)  Both b and c since they have the same focal length.

Photons of blue light

The amount of energy a photon carries depends on its wavelength.

What is the ratio of the light gathering power of a 10 m telescope to that of a 1 m telescope?

Astronomers build telescopes on tops of mountains because

Chromatic aberration occurs in a telescope when .

In a reflecting telescope, the objective is a mirror.

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

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

A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?

Long wavelength visible light

The sidereal drive on a telescope mounting must turn the telescope eastward about the polar axis.

A ____ has a few million light sensitive diodes in an array typically about a half-inch square.

What are sources of light pollution and how do those affects astronomical observations?

Radio telescopes are important in astronomy because

Which has the larger light-gathering power?

Here and Now

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

Sun Light and Sun Atoms

The Terrestrial Planets

The Outer Solar System

Origins of the Solar System and Extrasolar Planets

The Family of Stars

Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Life on Other Worlds

Filters

Exam 4: Light and Telescopes

Photons of blue light

The amount of energy a photon carries depends on its wavelength.

What is the ratio of the light gathering power of a 10 m telescope to that of a 1 m telescope?

Astronomers build telescopes on tops of mountains because

Chromatic aberration occurs in a ____ telescope when ____.

In a reflecting telescope, the objective is a mirror.

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

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

A wave on a lake is found to have a wavelength of 2 m and a frequency of 0.3 Hz. What is the speed of this wave?

Long wavelength visible light

The sidereal drive on a telescope mounting must turn the telescope eastward about the polar axis.

A ____ has a few million light sensitive diodes in an array typically about a half-inch square.

What are sources of light pollution and how do those affects astronomical observations?

Radio telescopes are important in astronomy because

Which has the larger light-gathering power?

Here and Now

Users Guide to the Sky: Patterns and Cycles

The Origin of Modern Astronomy

Sun Light and Sun Atoms

The Terrestrial Planets

The Outer Solar System

Origins of the Solar System and Extrasolar Planets

The Family of Stars

Structure and Formation of Stars

The Deaths of Stars

The Milky Way Galaxy

Galaxies: Normal and Active

Modern Cosmology

Life on Other Worlds

Filters

Chromatic aberration occurs in a telescope when .