Question 1

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

Accepted Answer

chromatic

Question 2

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

Accepted Answer

A) True 
 B)False

Question 3

Chromatic aberration affects reflector telescopes.

Accepted Answer

A) True 
 B)False

Question 4

How do radio interferometers greatly enhance resolution in radio wavelengths?

Accepted Answer

Hooking two or more radio dish

Question 5

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 6

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. 
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.

Question 7

Why do stars appear to twinkle?

Accepted Answer

In space, the light of the stars appears

Question 8

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

Accepted Answer

In the Newtonian, the eyepiece

Question 9

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. 
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.

Question 10

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. 
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.

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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

Accepted Answer

prime focu

Question 14

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

Accepted Answer

A)  Einstein 
B)  Kepler 
C)  Chandra 
D)  Hubble 
E)  Fermi 
A)  Einstein 
B)  Kepler 
C)  Chandra 
D)  Hubble 
E)  Fermi

Question 15

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 grasp 
A)  aperture 
B)  magnification 
C)  resolution 
D)  interference 
E)  light grasp

Question 16

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)  8 
A)  9 
B)  16 
C)  4 
D)  2 
E)  8

Question 17

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. 
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.

Question 18

Contrast image formation in reflectors and refractors.

Accepted Answer

Reflectors use a curved mirror

Question 19

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. 
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.

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

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

Chromatic aberration affects reflector telescopes.

How do radio interferometers greatly enhance resolution in radio wavelengths?

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

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

Why do stars appear to twinkle?

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

The most important advantage of CCDs over film is that

In astronomy, an interferometer can be used to

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

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

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

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

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

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

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

Contrast image formation in reflectors and refractors.

The primary purpose of a telescope is to

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Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

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Exam 4: Telescopes: the Tools of Astronomy

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

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

Chromatic aberration affects reflector telescopes.

How do radio interferometers greatly enhance resolution in radio wavelengths?

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

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

Why do stars appear to twinkle?

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

The most important advantage of CCDs over film is that

In astronomy, an interferometer can be used to

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

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

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

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

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

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

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

Contrast image formation in reflectors and refractors.

The primary purpose of a telescope is to

Charting the Heavens: the Foundations of Astronomy

The Copernican Revolution: the Birth of Modern Science

Light and Matter: the Inner Workings of the Cosmos

The Solar System: Interplanetary Matter and the Birth of the Planets

Earth and Its Moon: Our Cosmic Backyard

The Terrestrial Planets: a Study in Contrasts

The Jovian Planets: Giants of the Solar System

Moons, Rings, and Plutoids: Small Worlds Among Giants

The Sun: Our Parent Star

Measuring the Stars: Giants, Dwarfs, and the Main Sequence

The Interstellar Medium: Star Formation in the Milky Way

Stellar Evolution: the Lives and Deaths of Stars

Neutron Stars and Black Holes: Strange States of Matter

The Milky Way Galaxy: a Spiral in Space

Normal and Active Galaxies: Building Blocks of the Universe

Hubbles Law and Dark Matter: the Large-Scale Structure of the Cosmos

Cosmology: the Big Bang and the Fate of the Universe

Life in the Universe: Are We Alone

Filters