Question 1

Contrast image formation in reflectors and refractors.

Accepted Answer

Reflectors use a curved mirror...

Question 2

Compared to a 5- inch prime focus reflector, a 5- inch Newtonian reflector will

Accepted Answer

A)   have the same light gathering power.
B)   have more light gathering power.
C)   have more chromatic aberration.
D)   have a larger hole in the center of its mirror.
E)   be easier to build.F) D) and E)
G) A) and E)

Question 3

In design, most radio telescopes, like Arecibo, are .

Accepted Answer

prime focu...

Question 4

The most important advantage of CCDs over film is that

Accepted Answer

A)   they record colors better than film can.
B)   they can cover larger areas of the sky than film can.
C)   their images never fade, as film can.
D)   they record much more light in a given exposure time.
E)   their images do not have to be developed as film does.F) A) and E)
G) B) and D)

Question 5

Optical telescopes are usually used only at night, but radio telescopes can be used day or night.

Accepted Answer

A) True 
 B)False

Question 6

All optical telescopes will bring the light from a star to a focus.

Accepted Answer

A) True 
 B)False

Question 7

How do radio interferometers greatly enhance resolution in radio wavelengths?

Accepted Answer

Hooking two or more radio dish...

Question 8

It is diffraction that limits the _ _ of a telescope of a given objective diameter.

Accepted Answer

A)   aperture
B)   magnification
C)   resolution
D)   interference
E)   light graspF) B) and E)
G) A) and D)

Question 9

An advantage a reflector has over a refractor is the elimination of .

Accepted Answer

chromatic ...

Question 10

Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?

Accepted Answer

A)   Lenses absorb light, while mirrors do not.
B)   Lenses are subject to chromatic aberration.
C)   Heavy lenses, which can only be supported at their edges, tend to deform under their own weight.
D)   A lens must have two precision surfaces; a mirror needs only one.
E)   Lenses are harder to focus than mirrors.F) A) and D)
G) A) and B)

Question 11

A telescope design that uses a lens and no mirrors is a refractor.

Accepted Answer

A) True 
 B)False

Question 12

Why is the Hubble Space Telescope equipped with more infrared and ultraviolet detectors than are optical telescopes on the ground?

Accepted Answer

Operating above the atmosphere...

Question 13

The Space Telescope still gives us the highest resolution optical images.

Accepted Answer

A)   Einstein
B)   Kepler
C)   Chandra
D)   Hubble
E)   FermiF) None of the above
G) C) and D)

Question 14

Chromatic aberration affects reflector telescopes.

Accepted Answer

A) True 
 B)False

Question 15

The primary purpose of a telescope is to

Accepted Answer

A)   separate light into its component wavelengths.
B)   measure the brightness of stars very accurately.
C)   collect a large amount of light and bring it into focus.
D)   make distant objects appear nearby.
E)   magnify distant objects.F) A) and C)
G) C) and E)

Question 16

Why do stars appear to twinkle?

Accepted Answer

In space, the light of the stars appears...

Question 17

How does the placement of the eyepiece with Newtonian and Cassegrain reflectors differ?

Accepted Answer

In the Newtonian, the eyepiece...

Question 18

The angular resolution of an 8 inch diameter telescope is times greater than that of a 2 inch diameter telescope.

Accepted Answer

A)   9
B)   16
C)   4
D)   2
E)   8F) C) and D)
G) A) and B)

Question 19

In astronomy, an interferometer can be used to

Accepted Answer

A)   improve the angular resolution of radio telescopes.
B)   speed up the processing of CCD images.
C)   decrease the effects of light pollution in getting darker sky backgrounds.
D)   yield better seeing conditions with optical telescopes.
E)   increase the sensitivity of infrared telescopes to longer wavelengths.F) B) and D)
G) A) and E)

Exam 4: Telescopes: the Tools of Astronomy

An advantage a reflector has over a refractor is the elimination of .

Correct Answer
verified
chromatic ...
View Answer

All optical telescopes will bring the light from a star to a focus.

Correct Answer
verified

Chromatic aberration affects reflector telescopes.

Correct Answer
verified

Contrast image formation in reflectors and refractors.

Correct Answer
verified
Reflectors use a curved mirror...
View Answer

Why do stars appear to twinkle?

Correct Answer
verified
In space, the light of the stars appears...
View Answer

How does the placement of the eyepiece with Newtonian and Cassegrain reflectors differ?

Correct Answer
verified
In the Newtonian, the eyepiece...
View Answer

In astronomy, an interferometer can be used to

Correct Answer
verified

The most important advantage of CCDs over film is that

Correct Answer
verified

Optical telescopes are usually used only at night, but radio telescopes can be used day or night.

Correct Answer
verified

In design, most radio telescopes, like Arecibo, are .

Correct Answer
verified
prime focu...
View Answer

It is diffraction that limits the _ _ of a telescope of a given objective diameter.

Correct Answer
verified

The angular resolution of an 8 inch diameter telescope is times greater than that of a 2 inch diameter telescope.

Correct Answer
verified

The primary purpose of a telescope is to

Correct Answer
verified

Why is the Hubble Space Telescope equipped with more infrared and ultraviolet detectors than are optical telescopes on the ground?

Correct Answer
verified
Operating above the atmosphere...
View Answer

Compared to a 5- inch prime focus reflector, a 5- inch Newtonian reflector will

Correct Answer
verified

Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?

Correct Answer
verified

How do radio interferometers greatly enhance resolution in radio wavelengths?

Correct Answer
verified
Hooking two or more radio dish...
View Answer

The Space Telescope still gives us the highest resolution optical images.

Correct Answer
verified

A telescope design that uses a lens and no mirrors is a refractor.

Correct Answer
verified

Exam 4: Telescopes: the Tools of Astronomy

An advantage a reflector has over a refractor is the elimination of .

Correct Answerverifiedchromatic ...View AnswerShow Answer

All optical telescopes will bring the light from a star to a focus.

Correct AnswerverifiedShow Answer

Chromatic aberration affects reflector telescopes.

Correct AnswerverifiedShow Answer

Contrast image formation in reflectors and refractors.

Correct AnswerverifiedReflectors use a curved mirror...View AnswerShow Answer

Why do stars appear to twinkle?

Correct AnswerverifiedIn space, the light of the stars appears...View AnswerShow Answer

How does the placement of the eyepiece with Newtonian and Cassegrain reflectors differ?

Correct AnswerverifiedIn the Newtonian, the eyepiece...View AnswerShow Answer

In astronomy, an interferometer can be used to

Correct AnswerverifiedShow Answer

The most important advantage of CCDs over film is that

Correct AnswerverifiedShow Answer

Optical telescopes are usually used only at night, but radio telescopes can be used day or night.

Correct AnswerverifiedShow Answer

In design, most radio telescopes, like Arecibo, are .

Correct Answerverifiedprime focu...View AnswerShow Answer

It is diffraction that limits the _ _ of a telescope of a given objective diameter.

Correct AnswerverifiedShow Answer

The angular resolution of an 8 inch diameter telescope is times greater than that of a 2 inch diameter telescope.

Correct AnswerverifiedShow Answer

The primary purpose of a telescope is to

Correct AnswerverifiedShow Answer

Why is the Hubble Space Telescope equipped with more infrared and ultraviolet detectors than are optical telescopes on the ground?

Correct AnswerverifiedOperating above the atmosphere...View AnswerShow Answer

Compared to a 5- inch prime focus reflector, a 5- inch Newtonian reflector will

Correct AnswerverifiedShow Answer

Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?

Correct AnswerverifiedShow Answer

How do radio interferometers greatly enhance resolution in radio wavelengths?

Correct AnswerverifiedHooking two or more radio dish...View AnswerShow Answer

The Space Telescope still gives us the highest resolution optical images.

Correct AnswerverifiedShow Answer

A telescope design that uses a lens and no mirrors is a refractor.

Correct AnswerverifiedShow Answer

Correct Answer
verified
chromatic ...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Reflectors use a curved mirror...
View Answer

Correct Answer
verified
In space, the light of the stars appears...
View Answer

Correct Answer
verified
In the Newtonian, the eyepiece...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
prime focu...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Operating above the atmosphere...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Hooking two or more radio dish...
View Answer

Correct Answer
verified

Correct Answer
verified