Question 1

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 2

In which part of the electromagnetic spectrum have astronomers been unable to get any information?

Accepted Answer

A)   gamma rays
B)   X-rays
C)   ultraviolet
D)   microwaves
E)   We now can access information in all spectral lengths.F) None of the above
G) B) and E)

Question 3

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

Accepted Answer

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

Question 4

Describe at least three advantages of CCD imaging over visual or photographic work.

Accepted Answer

The CCD is far more efficient in capturi...

Question 5

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) C) and D)
G) None of the above

Question 6

To reach the Cassegrain focus,a hole must be cut in the center of the primary mirror.

Accepted Answer

A) True 
 B)False

Question 7

Absorption of light passing through the glass is a bigger problem for Cassegrain reflectors than achromatic refractors.

Accepted Answer

A) True 
 B)False

Question 8

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

Accepted Answer

A) True 
 B)False

Question 9

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

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

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

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

In addition to visible light,Hubble can do some work in the infrared and ultraviolet portions of the spectrum.

Accepted Answer

A) True 
 B)False

Question 13

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) A) and B)
G) A) and C)

Question 14

The ________ is a measure of the stability of the atmosphere,usually degraded by turbulent currents in the air.

Accepted Answer

The answer of The ________ is a measure of the...

Question 15

The tendency of a wave to bend as it passes from one transparent medium to another is called:

Accepted Answer

A)   reflection.
B)   dispersion.
C)   refraction.
D)   diffraction.
E)   interference.F) C) and D)
G) A) and B)

Question 16

Optical interferometry is more in use than radio interferometry.

Accepted Answer

A) True 
 B)False

Question 17

Diffraction is the tendency of light to:

Accepted Answer

A)   spread around corners.
B)   separate into its component colors.
C)   bend through a lens.
D)   disperse within a prism.
E)   reflect off a mirror.F) D) and E)
G) A) and B)

Question 18

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 B)
G) A) and E)

Question 19

The design of modern X-ray telescopes depends on:

Accepted Answer

A)   lenses made of germanium.
B)   the prime focus design, with mirrors made of iron.
C)   grazing incidence optics.
D)   achromatic lenses to keep the X-rays in focus.
E)   the Cassegrain design, with mirrors made of lead.F) A) and B)
G) A) and C)

Question 20

Chromatic aberration affects refractor and reflector telescopes equally,unless they have very long focal lengths.

Accepted Answer

A) True 
 B)False

Exam 5: Telescopes: The Tools of Astronomy

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Chromatic aberration affects refractor and reflector telescopes equally,unless they have very long focal lengths.

Correct AnswerverifiedShow Answer

Optical interferometry is more in use than radio interferometry.

Correct AnswerverifiedShow Answer

Describe at least three advantages of CCD imaging over visual or photographic work.

Correct AnswerverifiedThe CCD is far more efficient in capturi...View AnswerShow Answer

The ________ is a measure of the stability of the atmosphere,usually degraded by turbulent currents in the air.

Correct AnswerverifiedShow Answer

Absorption of light passing through the glass is a bigger problem for Cassegrain reflectors than achromatic refractors.

Correct AnswerverifiedShow Answer

To reach the Cassegrain focus,a hole must be cut in the center of the primary mirror.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The design of modern X-ray telescopes depends on:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Diffraction is the tendency of light to:

Correct AnswerverifiedShow Answer

In which part of the electromagnetic spectrum have astronomers been unable to get any information?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The tendency of a wave to bend as it passes from one transparent medium to another is called:

Correct AnswerverifiedShow Answer

In addition to visible light,Hubble can do some work in the infrared and ultraviolet portions of the spectrum.

Correct AnswerverifiedShow Answer

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The CCD is far more efficient in capturi...
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