Question 1

A telescope with an 8- inch mirror will collect twice as much light as one with a 4- inch mirror.

Accepted Answer

A) True 
 B)False  False

Question 2

Galileo is credited with designing the first reflector telescope.

Accepted Answer

A) True 
 B)False  False

Question 3

Explain three advantages the Hubble Space Telescope has over all ground- based telescopes.

Accepted Answer

In space, HST can focus on infrared and ultraviolet waves invisible to ground- based observers. With no air, the seeing for Hubble is always perfect and images are much sharper than when viewed through our turbulent blanket of air, even with the best adaptive optics. As the Hubble orbits the Earth, it can be turned to view anything in the sky and not be limited by the local horizon.

Question 4

The 400" Keck reflector can see objects 100 times fainter than the 40" Yerkes lens.

Accepted Answer

A) True 
 B)False

Question 5

Why were the two Keck 400" telescopes placed together atop Mauna Kea?

Accepted Answer

The light of both telescopes is combined

Question 6

In general, as a telescope's diameter increases, its angular resolution _.

Accepted Answer

increases

Question 7

A major advantage of a Newtonian reflector over a refractor is

Accepted Answer

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

Question 8

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

Accepted Answer

A)  Cassegrain reflector 
B)  Newtonian reflector 
C)  grazing incidence reflector 
D)  prime focus reflector 
E)  Coude reflector 
A)  Cassegrain reflector 
B)  Newtonian reflector 
C)  grazing incidence reflector 
D)  prime focus reflector 
E)  Coude reflector

Question 9

What are adaptive optics designed to overcome? How is this done?

Accepted Answer

Adaptive optics attempt to overcome the

Question 10

You are a novice telescope builder. Should you attempt a 6" Newtonian or Cassegrain reflector first? Why?

Accepted Answer

The Newtonian uses only a curved main mi

Question 11

What are some advantages of radio telescopes over optical telescopes?

Accepted Answer

Radio telescopes can be used day or nigh

Question 12

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

Accepted Answer

A)  refraction 
B)  reflection 
C)  transmission 
D)  polarization 
E)  aberration 
A)  refraction 
B)  reflection 
C)  transmission 
D)  polarization 
E)  aberration

Question 13

Discuss several disadvantages of refractor versus reflector telescopes.

Accepted Answer

Refractors must use lenses, and thus all

Question 14

To a large degree, the has replaced photographic film for astronomical imaging.

Accepted Answer

The answer of To a large degree, the has replaced...

Question 15

The separation of red and blue light in single- lens telescopes is called aberration.

Accepted Answer

The answer of The separation of red and blue light...

Question 16

Grazing incidence optics are critical to focusing
A) infrared radiation.
B) radio waves.
C) X- rays.
D) ultraviolet light.
E) gamma rays.

Accepted Answer

The answer of Grazing incidence optics are critical to focusing
A)...

Question 17

When used in a single instrument to greatly enhance its resolution, the four separate mirrors of the VLT act as a(n) .

Accepted Answer

The answer of When used in a single instrument to...

Question 18

The simplest reflector telescope design is the prime focus reflector.

Accepted Answer

A) True 
 B)False

Question 19

One advantage of the Hubble Space Telescope over ground based ones is that

Accepted Answer

A)  its adaptive optics controls atmospheric blurring better. 
B)  in orbit, it can operate close to its diffraction limit at visible wavelengths. 
C)  it is larger than any Earth- based telescopes. 
D)  it can make better observations of the ozone layer. 
E)  it can better focus X- ray images. 
A)  its adaptive optics controls atmospheric blurring better. 
B)  in orbit, it can operate close to its diffraction limit at visible wavelengths. 
C)  it is larger than any Earth- based telescopes. 
D)  it can make better observations of the ozone layer. 
E)  it can better focus X- ray images.

Question 20

The large reflector, the 10 m Keck, gathers _ _ light than the 1.0 m Yerkes refractor.

Accepted Answer

A)  an equal amount of 
B)  100 times less 
C)  10 times more 
D)  100 times more 
E)  10 times less 
A)  an equal amount of 
B)  100 times less 
C)  10 times more 
D)  100 times more 
E)  10 times less

A telescope with an 8- inch mirror will collect twice as much light as one with a 4- inch mirror.

Galileo is credited with designing the first reflector telescope.

Explain three advantages the Hubble Space Telescope has over all ground- based telescopes.

The 400" Keck reflector can see objects 100 times fainter than the 40" Yerkes lens.

Why were the two Keck 400" telescopes placed together atop Mauna Kea?

In general, as a telescope's diameter increases, its angular resolution _.

A major advantage of a Newtonian reflector over a refractor is

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

What are adaptive optics designed to overcome? How is this done?

You are a novice telescope builder. Should you attempt a 6" Newtonian or Cassegrain reflector first? Why?

What are some advantages of radio telescopes over optical telescopes?

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

Discuss several disadvantages of refractor versus reflector telescopes.

To a large degree, the has replaced photographic film for astronomical imaging.

The separation of red and blue light in single- lens telescopes is called aberration.

Grazing incidence optics are critical to focusing A) infrared radiation. B) radio waves. C) X- rays. D) ultraviolet light. E) gamma rays.

When used in a single instrument to greatly enhance its resolution, the four separate mirrors of the VLT act as a(n) .

The simplest reflector telescope design is the prime focus reflector.

One advantage of the Hubble Space Telescope over ground based ones is that

The large reflector, the 10 m Keck, gathers _ _ light than the 1.0 m Yerkes refractor.

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

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Exam 4: Telescopes: the Tools of Astronomy

A telescope with an 8- inch mirror will collect twice as much light as one with a 4- inch mirror.

Galileo is credited with designing the first reflector telescope.

Explain three advantages the Hubble Space Telescope has over all ground- based telescopes.

The 400" Keck reflector can see objects 100 times fainter than the 40" Yerkes lens.

Why were the two Keck 400" telescopes placed together atop Mauna Kea?

In general, as a telescope's diameter increases, its angular resolution _.

A major advantage of a Newtonian reflector over a refractor is

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

What are adaptive optics designed to overcome? How is this done?

You are a novice telescope builder. Should you attempt a 6" Newtonian or Cassegrain reflector first? Why?

What are some advantages of radio telescopes over optical telescopes?

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

Discuss several disadvantages of refractor versus reflector telescopes.

To a large degree, the has replaced photographic film for astronomical imaging.

The separation of red and blue light in single- lens telescopes is called aberration.

Grazing incidence optics are critical to focusing A) infrared radiation. B) radio waves. C) X- rays. D) ultraviolet light. E) gamma rays.

When used in a single instrument to greatly enhance its resolution, the four separate mirrors of the VLT act as a(n) .

The simplest reflector telescope design is the prime focus reflector.

One advantage of the Hubble Space Telescope over ground based ones is that

The large reflector, the 10 m Keck, gathers _ _ light than the 1.0 m Yerkes refractor.

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

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