Question 1

CCD detectors gather light 10- 20 times faster than the most sensitive photographic film.

Accepted Answer

A) True 
 B)False

Question 2

Name two advantages of larger telescopes over smaller ones.

Accepted Answer

Larger objectives gather more ...

Question 3

The light- gathering ability of a telescope is most dependent on the diameter of its primary objective.

Accepted Answer

A) True 
 B)False

Question 4

The Cassegrain reflector needs a primary concave main mirror and a smaller, convex secondary mirror to reflect light back through a hole in the primary.

Accepted Answer

A) True 
 B)False

Question 5

The Earth's atmosphere is the major factor limiting the use of ground- based radio telescopes.

Accepted Answer

A) True 
 B)False

Question 6

Mt. Palomar's 200" Hale telescope is the largest reflector now in service.

Accepted Answer

A) True 
 B)False

Question 7

Why is a CCD image much faster to obtain than a photograph?

Accepted Answer

CCDs can obtain images faster ...

Question 8

What is the resolution of a telescope?

Accepted Answer

A)   its ability to see very faint objects
B)   its ability to focus more than just visible light for imaging
C)   its ability to separate light into its component colors for analysis
D)   its ability to make distant objects appear much closer to us
E)   its ability to distinguish two adjacent objects close together in the skyF) All of the above
G) A) and B)

Question 9

The Hubble Space Telescope gives us its best resolution with X- rays.

Accepted Answer

A) True 
 B)False

Question 10

Explain the basic principle behind the VLA.

Accepted Answer

The Very Large Array is a series of radi...

Question 11

Stars do not twinkle; the instability of the atmosphere causes this effect.

Accepted Answer

A) True 
 B)False

Question 12

In the future, adaptive optics will greatly enhance the resolution of the Hubble Space Telescope.

Accepted Answer

A) True 
 B)False

Question 13

Like radio and optical astronomy, infrared astronomy is easily done with ground- based telescopes.

Accepted Answer

A) True 
 B)False

Question 14

Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows

Accepted Answer

A)   chromatic aberration to be reduced.
B)   X- rays to be focused.
C)   more light to be gathered.
D)   greater magnification.
E)   effects of atmospheric turbulence to be reduced.F) B) and D)
G) B) and C)

Question 15

Which type of telescope has the simplest light path?

Accepted Answer

A)   achromatic refractor
B)   prime focus reflector
C)   Cassegrain reflector
D)   single lens refractor
E)   Newtonian reflectorF) B) and E)
G) A) and B)

Question 16

The focus reflector needs only a single optical surface to form images.

Accepted Answer

The answer of The focus reflector needs only a single...

Question 17

Contrast the main mirrors of Newtonian and Cassegrain designs.

Accepted Answer

Both use a curved mirror, but the Newton...

Question 18

What is a CCD, and how does it work? Why is it replacing film?

Accepted Answer

A charge coupled device consists of a gr...

Question 19

There are ground- based telescopes much larger than Hubble, yet the HST still reveals the faintest objects yet seen. Explain.

Accepted Answer

In space, HST can operate clos...

Question 20

All modern large optical telescopes are refractors.

Accepted Answer

A) True 
 B)False

Exam 4: Telescopes: the Tools of Astronomy

There are ground- based telescopes much larger than Hubble, yet the HST still reveals the faintest objects yet seen. Explain.

Correct AnswerverifiedIn space, HST can operate clos...View AnswerShow Answer

Stars do not twinkle; the instability of the atmosphere causes this effect.

Correct AnswerverifiedShow Answer

Which type of telescope has the simplest light path?

Correct AnswerverifiedShow Answer

What is a CCD, and how does it work? Why is it replacing film?

Correct AnswerverifiedA charge coupled device consists of a gr...View AnswerShow Answer

The focus reflector needs only a single optical surface to form images.

Correct AnswerverifiedShow Answer

Mt. Palomar's 200" Hale telescope is the largest reflector now in service.

Correct AnswerverifiedShow Answer

CCD detectors gather light 10- 20 times faster than the most sensitive photographic film.

Correct AnswerverifiedShow Answer

Like radio and optical astronomy, infrared astronomy is easily done with ground- based telescopes.

Correct AnswerverifiedShow Answer

The Earth's atmosphere is the major factor limiting the use of ground- based radio telescopes.

Correct AnswerverifiedShow Answer

Why is a CCD image much faster to obtain than a photograph?

Correct AnswerverifiedCCDs can obtain images faster ...View AnswerShow Answer

The Hubble Space Telescope gives us its best resolution with X- rays.

Correct AnswerverifiedShow Answer

Contrast the main mirrors of Newtonian and Cassegrain designs.

Correct AnswerverifiedBoth use a curved mirror, but the Newton...View AnswerShow Answer

All modern large optical telescopes are refractors.

Correct AnswerverifiedShow Answer

The Cassegrain reflector needs a primary concave main mirror and a smaller, convex secondary mirror to reflect light back through a hole in the primary.

Correct AnswerverifiedShow Answer

Adding a secondary concave lens of carefully chosen different glass to the primary lens on a refractor allows

Correct AnswerverifiedShow Answer

Explain the basic principle behind the VLA.

Correct AnswerverifiedThe Very Large Array is a series of radi...View AnswerShow Answer

In the future, adaptive optics will greatly enhance the resolution of the Hubble Space Telescope.

Correct AnswerverifiedShow Answer

The light- gathering ability of a telescope is most dependent on the diameter of its primary objective.

Correct AnswerverifiedShow Answer

What is the resolution of a telescope?

Correct AnswerverifiedShow Answer

Name two advantages of larger telescopes over smaller ones.

Correct AnswerverifiedLarger objectives gather more ...View AnswerShow Answer

Correct Answer
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In space, HST can operate clos...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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A charge coupled device consists of a gr...
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
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Correct Answer
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CCDs can obtain images faster ...
View Answer

Correct Answer
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Correct Answer
verified
Both use a curved mirror, but the Newton...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
The Very Large Array is a series of radi...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Larger objectives gather more ...
View Answer