Question 1

The James Webb Space Telescope is optimized to observe ________ radiation.

Accepted Answer

The answer of The James Webb Space Telescope is optimized...

Question 2

What is the resolving power of the telescope?

Accepted Answer

A)  the ability to make distant objects appear closer
B)  the ability to collect a lot of light
C)  the ability to detect very faint objects
D)  the ability to distinguish adjacent objects in the sky
E)  the ability to separate light into its component colorsF) D) and E)
G) A) and D)

Question 3

What is "seeing"?

Accepted Answer

A)  a measure of the quality of the telescope's optics
B)  a measure of the transparency of the scope's objective lens
C)  a measurement of the sharpness of vision of the astronomer's eyes
D)  a measurement of the image quality due to air stability
E)  a measurement of clarity and absence of cloudsF) D) and E)
G) B) and D)

Question 4

The Arecibo radio telescope is laid out like which optical telescope design?

Accepted Answer

A)  prime focus reflector
B)  Newtonian reflector
C)  Cassegrain reflector
D)  Coude reflector
E)  grazing incidence reflectorF) B) and E)
G) None of the above

Question 5

If the ________ is good, the atmosphere is stable, and image quality is sharp.

Accepted Answer

The answer of If the ________ is good, the atmosphere...

Question 6

A major advantage of a Newtonian reflector over a refractor is:

Accepted Answer

A)  its compact size.
B)  the elimination of chromatic aberration.
C)  there are only two lenses to grind.
D)  the central hole in the mirror is smaller.
E)  the elimination of the secondary mirror.F) A) and D)
G) B) and D)

Question 7

Based on their optical design, would an airline rather you bring your 8" Newtonian orCassegrain to the next eclipse? Why?

Accepted Answer

Considering the restrictions o...

Question 8

Because of ________, images in small telescopes are more blurred than with larger objectives.

Accepted Answer

The answer of Because of ________, images in small telescopes...

Question 9

Why do stars appear to twinkle?

Accepted Answer

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

Question 10

The amount of diffraction a telescope creates depends upon:

Accepted Answer

A)  whether the telescope is a refractor or a reflector.
B)  the wavelength and the diameter of the telescope objective.
C)  the magnification of the eyepiece.
D)  the types of glass used in the achromat.
E)  the transparency of the atmosphere.F) A) and E)
G) D) and E)

Question 11

Which of the following is currently supplying high resolution X-ray images from space?

Accepted Answer

A)  ROSAT
B)  Chandra
C)  Einstein
D)  HEAO-2
E)  COBEF) A) and E)
G) A) and B)

Question 12

The process occurring when photons bounce off a polished surface is called:

Accepted Answer

A)  diffraction.
B)  refraction.
C)  reflection.
D)  dispersion.
E)  interference.F) None of the above
G) A) and B)

Question 13

Radio telescopes have poorer angular resolution than optical telescopes because radio waveshave a much longer wavelength than optical waves.

Accepted Answer

A) True 
 B)False

Question 14

Which design has a convex primary mirror and flat secondary mirror, with the eyepiecelocated on the top side of the telescope tube?

Accepted Answer

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

Question 15

The light-gathering power of a telescope varies with the ________ of the diameter of the lensor mirror.

Accepted Answer

The answer of The light-gathering power of a telescope varies...

Question 16

Which of the following is a problem inherent in all large radio telescopes?

Accepted Answer

A)  They are badly affected by poor seeing and atmospheric turbulence.
B)  The lightest breeze shakes them, making the observations blurry.
C)  Their waves are blocked by water vapor, so they must be located in deserts.
D)  Radio waves have long wavelengths, so radio telescopes have poor resolution.
E)  The dust clouds in the Milky Way block almost all wavelengths except light.F) C) and D)
G) All of the above

Question 17

Very accurate measurements of stellar brightnesses and sudden changes are made with a(n)________.

Accepted Answer

The answer of Very accurate measurements of stellar brightnesses and...

Question 18

Which method of astronomical measurement is the precise measurement of brightness?

Accepted Answer

A)  spectroscopy
B)  photography
C)  astrometry
D)  photometry
E)  interferometryF) A) and B)
G) C) and D)

Question 19

Which design is subject to chromatic aberration?

Accepted Answer

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

Question 20

Why are most large telescopes reflectors, not refractors?

Accepted Answer

A)  Large lenses deform under their own weight, but mirrors can be supported.
B)  Large mirrors need only one optical surface, achromats four surfaces to grind.
C)  Reflectors do not suffer from chromatic aberration like refractors do.
D)  Large, very clear lenses are harder to cast than more tolerant mirror blanks.
E)  All of the above are correct.F) A) and E)
G) D) and E)

Exam 5: Telescopes: The Tools of Astronomy

If the ________ is good, the atmosphere is stable, and image quality is sharp.

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What is "seeing"?

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What is the resolving power of the telescope?

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Why do stars appear to twinkle?

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

The process occurring when photons bounce off a polished surface is called:

Correct AnswerverifiedShow Answer

Which design is subject to chromatic aberration?

Correct AnswerverifiedShow Answer

Because of ________, images in small telescopes are more blurred than with larger objectives.

Correct AnswerverifiedShow Answer

The amount of diffraction a telescope creates depends upon:

Correct AnswerverifiedShow Answer

Very accurate measurements of stellar brightnesses and sudden changes are made with a(n)________.

Correct AnswerverifiedShow Answer

Which method of astronomical measurement is the precise measurement of brightness?

Correct AnswerverifiedShow Answer

Why are most large telescopes reflectors, not refractors?

Correct AnswerverifiedShow Answer

Which of the following is currently supplying high resolution X-ray images from space?

Correct AnswerverifiedShow Answer

Based on their optical design, would an airline rather you bring your 8" Newtonian orCassegrain to the next eclipse? Why?

Correct AnswerverifiedConsidering the restrictions o...View AnswerShow Answer

The James Webb Space Telescope is optimized to observe ________ radiation.

Correct AnswerverifiedShow Answer

Which of the following is a problem inherent in all large radio telescopes?

Correct AnswerverifiedShow Answer

Radio telescopes have poorer angular resolution than optical telescopes because radio waveshave a much longer wavelength than optical waves.

Correct AnswerverifiedShow Answer

Which design has a convex primary mirror and flat secondary mirror, with the eyepiecelocated on the top side of the telescope tube?

Correct AnswerverifiedShow Answer

The light-gathering power of a telescope varies with the ________ of the diameter of the lensor mirror.

Correct AnswerverifiedShow Answer

A major advantage of a Newtonian reflector over a refractor is:

Correct AnswerverifiedShow Answer

The Arecibo radio telescope is laid out like which optical telescope design?

Correct AnswerverifiedShow Answer

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In space, the light of the stars appears...
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Considering the restrictions o...
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