Astronomy A Beginners Guide To The Universe 7th Edition By Chaisson

Astronomy A Beginners Guide To The Universe 7th
Edition By Chaisson – Test Bank

Astronomy: A Beginner’s Guide to the Universe, 7e (Chaisson/McMillan)
Chapter 3 Telescopes: The Tools of Astronomy

1) The simplest reflector telescope design is the prime focus reflector.
Answer: TRUE
Diff: 1
Section Ref.: 3.1

2) Galileo is credited with designing the first reflector telescope.
Answer: FALSE
Diff: 1
Section Ref.: 3.1

3) Chromatic aberration affects reflector telescopes.
Answer: FALSE
Diff: 1
Section Ref.: 3.1

4) All optical telescopes will bring the light from a star to a focus.
Answer: TRUE
Diff: 1
Section Ref.: 3.1

5) A telescope design that uses a lens and no mirrors is a refractor.
Answer: TRUE
Diff: 1
Section Ref.: 3.1

6) CCD detectors gather light 10-20 times faster than the most sensitive photographic film.
Answer: TRUE
Diff: 1
Section Ref.: 3.1

7) A Newtonian reflector needs no secondary mirror.
Answer: FALSE
Diff: 2
Section Ref.: 3.1

8) The Hubble Space Telescope gives us its best resolution with X-rays.

,Answer: FALSE
Diff: 2
Section Ref.: 3.1


9) The Cassegrain reflector needs a primary concave main mirror and a smaller, convex secondary mirror to
reflect light back through a hole in the primary.
Answer: TRUE
Diff: 2
Section Ref.: 3.1
10) Photography with film is still the preferred way of capturing fine detail in the faintest, most distant
galaxies.
Answer: FALSE
Diff: 2
Section Ref.: 3.1

11) The light-gathering ability of a telescope is most dependent on the diameter of its primary objective.
Answer: TRUE
Diff: 1
Section Ref.: 3.2

12) Mt. Palomar’s 200″ Hale telescope is the largest reflector now in service.
Answer: FALSE
Diff: 2
Section Ref.: 3.2

13) A telescope with an 8-inch mirror will collect twice as much light as one with a 4-inch mirror.
Answer: FALSE
Diff: 3
Section Ref.: 3.2

14) The 400″ Keck reflector can see objects 100 times fainter than the 40″ Yerkes lens.
Answer: TRUE
Diff: 3
Section Ref.: 3.2

15) Radio telescopes have poorer angular resolution than optical telescopes because radio waves have a
much longer wavelength than optical waves.
Answer: TRUE
Diff: 1
Section Ref.: 3.2, 3.4

16) All modern large optical telescopes are refractors.
Answer: FALSE
Diff: 1
Section Ref.: 3.2

,17) Stars do not twinkle; the instability of the atmosphere causes this effect.
Answer: TRUE
Diff: 1
Section Ref.: 3.3

18) The opacity of the atmosphere is partially corrected via adaptive optics.
Answer: FALSE
Diff: 2
Section Ref.: 3.3
19) In the future, adaptive optics will greatly enhance the resolution of the Hubble Space Telescope.
Answer: FALSE
Diff: 3
Section Ref.: 3.3, 3.1

20) Optical telescopes are usually used only at night, but radio telescopes can be used day or night. Answer:
TRUE
Diff: 1
Section Ref.: 3.4

21) The Earth’s atmosphere is the major factor limiting the use of ground-based radio telescopes.Answer:
FALSE
Diff: 1
Section Ref.: 3.4

22) Optical interferometry is more in use than radio interferometry.
Answer: FALSE
Diff: 2
Section Ref.: 3.4

23) Radio astronomy can only be done from up in space, due to our ionosphere.
Answer: FALSE
Diff: 2
Section Ref.: 3.4

24) Like radio and optical astronomy, infrared astronomy is easily done with ground-based telescopes.
Answer: FALSE
Diff: 1
Section Ref.: 3.5

25) Due to our ozone layer, ultraviolet astronomy must be done from space.
Answer: TRUE
Diff: 1
Section Ref.: 3.5

, 26) The mirrors for X-ray telescopes are the same shape as those of optical reflectors.
Answer: FALSE
Diff: 2
Section Ref.: 3.5

27) The Compton GRO was the first telescope used for our exploration of high-energy astronomy.
Answer: FALSE
Diff: 2
Section Ref.: 3.5

28) Galaxies look the same whether viewed in visible or X-ray wavelengths.
Answer: FALSE
Diff: 2
Section Ref.: 3.5
29) Which type of telescope has the simplest light path?
1. A) prime focus reflector
2. B) single lens refractor
3. C) achromatic refractor
4. D) Newtonian reflector
5. E) Cassegrain reflector
Answer: A
Diff: 1
Section Ref.: 3.1

30) Which of the following is NOT a reason to use a reflecting telescope rather than a refractor?
1. A) Lenses are subject to chromatic aberration.
2. B) Lenses are harder to focus than mirrors.
3. C) Lenses absorb light, while mirrors do not.
4. D) Heavy lenses, which can only be supported at their edges, tend to deform under their own
weight.
5. E) A lens must have two precision surfaces; a mirror needs only one.
Answer: B
Diff: 2
Section Ref.: 3.1

31) What problem do refractor telescopes have that reflectors don’t?
1. A) diffraction limited resolution
2. B) light loss from secondary elements
3. C) chromatic aberration
4. D) atmospheric blurring
5. E) bad seeing
Answer: C
Diff: 1
Section Ref.: 3.1

32) The most important advantage of CCDs over film is that