Question 1

Compared to optical telescopes, radio telescopes are built large because:

Accepted Answer

A)  they're less expensive to make than optical telescopes.
B)  radio photons don't carry much energy.
C)  atmospheric turbulence is more of a problem.
D)  radio sources are harder to find.
E)  radio waves are absorbed by the atmosphere.F) A) and B)
G) All of the above

Question 2

What are some advantages of radio telescopes over optical scopes?

Accepted Answer

Radio telescopes can be used day or nigh...

Question 3

The Atacama Large Millimeter Array achieves exceptional resolution by usingexceptionally:

Accepted Answer

A)  large radio antennas in a fixed array.
B)  large radio antennas in a mobile array.
C)  many radio antennas in a fixed array.
D)  many radio antennas in a mobile array.
E)  many portions of the electromagnetic spectrum.F) A) and B)
G) None of the above

Question 4

The amount of diffraction, and thus the resolution of the scope, depends upon:

Accepted Answer

A)  the wavelength used and the size of the main telescope objective lens or mirror.
B)  the design of the telescope.
C)  whether the telescope is a reflector or refractor.
D)  the brightness of the object.
E)  the size and sensitivity of the CCD chip used for imaging.F) B) and C)
G) C) and D)

Question 5

You are going to construct a new optical observatory, and money is no object. Other thanputting it into space, what factors will affect your decision for its location on Earth?

Accepted Answer

Closer to the equator will give you a vi...

Question 6

Radio telescopes have poorer angular resolution than optical telescopes because:

Accepted Answer

A)  the reflecting surfaces in radio telescopes have holes in them.
B)  radio telescopes often use multiple telescopes to make observations.
C)  radio is distorted more by Earth's atmosphere than visible light is.
D)  the wavelength of radio waves is longer than that of visible light.
E)  Radio telescopes actually have better resolution than optical telescopes.F) None of the above
G) A) and D)

Question 7

One reason for building telescopes on mountain tops is that they improve seeing by reducingthe amount of air above the observer.

Accepted Answer

A) True 
 B)False

Question 8

The Fermi Space Telescope observes ________ radiation.

Accepted Answer

The answer of The Fermi Space Telescope observes ________ radiation....

Question 9

Green light has a shorter wavelength than orange light. In a 5-inch telescope, green light will:

Accepted Answer

A)  provide better angular resolution than orange light.
B)  come to the same exact focus as orange light.
C)  provide worse angular resolution than orange light.
D)  allow dimmer stars to be observed.
E)  reduce the effects of atmospheric turbulence.F) None of the above
G) C) and D)

Question 10

This design involves only one optical surface, a concave mirror.

Accepted Answer

A)  prime focus reflector
B)  Newtonian reflector
C)  Cassegrain reflector
D)  Gregorian reflector
E)  refractorF) None of the above
G) C) and D)

Question 11

Refractor telescopes suffer from this separation of light into its component colors.

Accepted Answer

A)  limited diffraction
B)  spherical aberration
C)  chromatic aberration
D)  bad seeing
E)  refractionF) None of the above
G) B) and D)

Question 12

The twinkling of starlight and the focusing of images by lenses are due to ________ of light.

Accepted Answer

The answer of The twinkling of starlight and the focusing...

Question 13

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

Accepted Answer

A) True 
 B)False

Question 14

What are two advantages of large telescopes over smaller ones?

Accepted Answer

A)  Large telescopes have a larger field of view and sharper focus.
B)  Large telescopes are not subject to atmospheric turbulence and opacity like smaller ones.
C)  Large telescopes are easier to mount and control than small ones.
D)  Large telescopes have more light grasp and better resolution.
E)  Large telescopes give higher magnification and are easier to build.F) C) and D)
G) C) and E)

Question 15

You could more easily resolve a close double star with a blue filter than with a red one.

Accepted Answer

A) True 
 B)False

Question 16

The convex secondary mirror in this design focuses light down through a hole cut in theconcave primary mirror.

Accepted Answer

A)  refractor
B)  prime focus reflector
C)  Newtonian reflector
D)  Cassegrain reflector
E)  interferometerF) A) and B)
G) B) and E)

Question 17

Due to our ozone layer, ultraviolet astronomy must be done from space.

Accepted Answer

A) True 
 B)False

Question 18

Why must radio dishes be built so large?

Accepted Answer

Radio waves carry little energ...

Question 19

Which of the following greatly improves the angular resolution of radio maps?

Accepted Answer

A)  Schmidt corrector plates
B)  more sensitive spectrometers
C)  switching from photographic plates to CCD imaging
D)  use of interferometers
E)  chilling the infrared detectorsF) B) and E)
G) C) and E)

Question 20

It is much easier to build large reflectors than large refractors.

Accepted Answer

A) True 
 B)False

Exam 5: Telescopes: The Tools of Astronomy

This design involves only one optical surface, a concave mirror.

Correct AnswerverifiedShow Answer

The Atacama Large Millimeter Array achieves exceptional resolution by usingexceptionally:

Correct AnswerverifiedShow Answer

Why must radio dishes be built so large?

Correct AnswerverifiedRadio waves carry little energ...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

It is much easier to build large reflectors than large refractors.

Correct AnswerverifiedShow Answer

Green light has a shorter wavelength than orange light. In a 5-inch telescope, green light will:

Correct AnswerverifiedShow Answer

What are two advantages of large telescopes over smaller ones?

Correct AnswerverifiedShow Answer

You are going to construct a new optical observatory, and money is no object. Other thanputting it into space, what factors will affect your decision for its location on Earth?

Correct AnswerverifiedCloser to the equator will give you a vi...View AnswerShow Answer

You could more easily resolve a close double star with a blue filter than with a red one.

Correct AnswerverifiedShow Answer

The convex secondary mirror in this design focuses light down through a hole cut in theconcave primary mirror.

Correct AnswerverifiedShow Answer

Which of the following greatly improves the angular resolution of radio maps?

Correct AnswerverifiedShow Answer

Compared to optical telescopes, radio telescopes are built large because:

Correct AnswerverifiedShow Answer

What are some advantages of radio telescopes over optical scopes?

Correct AnswerverifiedRadio telescopes can be used day or nigh...View AnswerShow Answer

The Fermi Space Telescope observes ________ radiation.

Correct AnswerverifiedShow Answer

One reason for building telescopes on mountain tops is that they improve seeing by reducingthe amount of air above the observer.

Correct AnswerverifiedShow Answer

Refractor telescopes suffer from this separation of light into its component colors.

Correct AnswerverifiedShow Answer

The amount of diffraction, and thus the resolution of the scope, depends upon:

Correct AnswerverifiedShow Answer

Due to our ozone layer, ultraviolet astronomy must be done from space.

Correct AnswerverifiedShow Answer

The twinkling of starlight and the focusing of images by lenses are due to ________ of light.

Correct AnswerverifiedShow Answer

Radio telescopes have poorer angular resolution than optical telescopes because:

Correct AnswerverifiedShow Answer

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Radio waves carry little energ...
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Closer to the equator will give you a vi...
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Radio telescopes can be used day or nigh...
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