chapter 6 astronomy
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50 Terms
1
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Which type of focus is most common for larger telescopes?
Cassegrain focus
2
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Why aren't optical or radio telescopes used in particle astronomy, which studies cosmic waves and gravity waves?
Optical and radio telescopes can only detect electromagnetic radiation.
3
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What must be used to maintain the optics and operation of an infrared telescope?
coolant
4
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Space-based telescopes carrying long-wavelength infrared detectors must carry coolant such as liquid helium to chill their optics to near absolute zero temperature.
true
5
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Which form of radiation has the lowest frequency?
microwave
6
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The larger the diameter of a telescope, the more light it will collect.
True
7
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What is the function of the receiver antenna of a radio telescope?
To absorb the radio energy collected by the dish
8
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What is so unique about the mirrors of telescopes such as the Keck Observatory, Gran Telescopio Canaries, and the soon-to-be-built Giant Magellan Telescope?
The mirrors are segmented
9
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What type of electromagnetic radiation does Chandra collect?
X-ray
10
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Light-gathering power and resolving power both depend on what characteristic of a telescope?
diameter
11
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Where would you most likely find a large radio telescope?
in a mountain valley
12
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The Very Large Array radio telescope in New Mexico is an example of the use of which astronomical technique?
interferometry
13
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Refracting and reflecting telescopes form an image that is small, inverted, and difficult to observe directly; therefore, an eyepiece is normally used to magnify the image and make it convenient to view.
True
14
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Reflecting telescopes suffer from chromatic aberration because the light must pass through the glass.
false
15
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Which type of electromagnetic wave is the shortest?
gamma
16
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Which telescope will be launched into solar orbit and eventually replace observations made by the Hubble Space Telescope?
JWST
17
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What is the shape of the segmented mirrors of twin Keck Observatory telescopes, Gran Telescopio Canarias, and the James Webb Space Telescope (scheduled to be launched in late 2018)?
hexagonal
18
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All telescopes must be operated on site by an astronomer or a technician.
false
19
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n the above image (Figure 6-1), what part of the telescope is represented by the pointer?
achromatic lense
20
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Which part of a telescope is responsible for magnifying an image?
eyepiece
21
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Jenny, who lives on a farm in a rural part of New York, calls her cousin, Karen, in Brooklyn, to tell her that she can see the Milky Way in tonight's night sky. However, Karen says she can't see it at all. What is preventing Karen from seeing the Milky Way in the night sky?
Karen lives in an area with light pollution
22
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Radio telescopes are often located near populated areas.
false
23
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A(n) __________ is both an image-recording device and a photometer.
CCD
24
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What characteristic of a telescope controls the amount of light captured by the telescope?
diameter of the tube
25
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Diffraction, optical quality, and atmospheric conditions all contribute to the limitations of what power of a telescope?
resolving power
26
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What does a refracting telescope use to gather and focus light?
lens
27
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Refracting telescopes use a mirror to gather and focus light.
false
28
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The energy a photon carries is inversely proportional to __________.
its wavelength
29
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Which form of electromagnetic radiation is able to easily reach Earth's surface through an atmospheric window?
radio
30
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If telescope A is 160 cm in diameter, and telescope B is 32 cm in diameter, how much more light does telescope A gather than telescope B?
25 times
31
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The ____ of a radio telescope collects and focuses radiation.
dish
32
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No radio waves penetrate the Earth's atmosphere.
false
33
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A spectrograph spreads out light according to ____ to form a spectrum.
wavelength
34
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What telescope instrument is used to counter the eastward rotation of Earth?
sidereal drive
35
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gravity waves have never been detected
false
36
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What unit is used to measure wavelengths?
nanometer
37
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Which power of a telescope reveals fine details within an image?
resolving power
38
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CCD images captured from telescopes are often ____ to be stored in a computer's memory for later analysis.
converted to numerical data
39
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Visible light with wavelengths at the long-wavelength end (λ = 700 nm) appears as which color?
red
40
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What technique often requires the use of a laser guide star?
adaptive optics
41
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Resolving power is measured in nanometers.
false
42
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What modern-day instrument do astronomers use to record images from telescopes?
charge-coupled device
43
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What does chromatic aberration separate within refracting telescopes?
color
44
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What is a major selecting factor for astronomers looking to place a telescope atop a mountain?
non-turbulent airflow
45
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Cosmic rays are made of photons.
false
46
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Which is the longest surviving, and most successful, space telescope?
Hubble space telescope
47
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Short-focal-length lenses and mirrors must be strongly curved.
true
48
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Why are X-rays and gamma rays considered dangerous forms of light?
photons of these wavelengths have high energy
49
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Red light of the visible light spectrum has longer wavelengths than blue.
true
50
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Which telescope is the largest refracting telescope in the world?
\n Yerkes Observatory refractor telescope
Note 
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