06Ch_HW_Fall2021
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Astronomy
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Dec 6, 2023
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Montgomery College – Rockville
Astronomy 101 ASTR101 Fall 2021
Chapter 6 Homework (6 points)
Fall 2021
1
Ch. 6 Astronomical Instruments
Problem Solving
1.
How much more light can a telescope with a 14-inch diameter mirror gather compared
with a 4-inch diameter telescope?
Multiple Choice.
For the following questions select the best answer.
2.
When a knowledgeable amateur astronomer tells you that they have a 20-inch telescope,
what does the number 20 refer to?
A.
the number of times the image is magnified (how much bigger it looks)
B.
the length of the main telescope tube
C.
the focal length
D.
the length of the eyepiece tube
E.
the diameter of the primary lens or mirror
3.
A group of astronomers are studying galaxies of stars that are very far away and thus
look extremely faint (using visible light). What kind of telescope should they apply for
time on?
A.
a refractor
B.
the telescope with the biggest aperture possible
C.
a telescope with a small aperture but with eyepieces that have good
magnification
D.
a telescope built before 1948
E.
any telescope will show faint galaxies well; they should just use the one closest to
their campus
ASTR101
Ch. 6 HW
Fall 2021
2
4.
To overcome the problems that blur images and don’t provide the best resolution from
Earth, astronomers have started using flexible mirrors that change shape many times
each second. This technique is called:
A.
adaptive optics
B.
focal length adjustment
C.
lowering resolution
D.
light pollution
E.
interferometry
5.
Your friend, a graduate student in astronomy, is giving you a special tour of the local
observatory. You notice that you are viewing the image from the big telescope from
underneath the primary mirror; the beam of light has come through a small hole in the
main mirror to an eyepiece below. This telescope uses what focusing arrangement?
A.
prime focus
B.
Newtonian focus
C.
Cassegrain focus
D.
Galilean focus
E.
out of focus
6.
The two regions of the electromagnetic spectrum where the Earth's atmosphere is
transparent (radiation can get in) are visible light and:
A.
ultraviolet
B.
x-rays
C.
some radio waves
D.
gamma-rays
E.
you can't fool me, the atmosphere is transparent ONLY for visible light
7.
The Fermi spacecraft observes
A.
long-wavelength infrared light
B.
visible light
C.
ultraviolet light
D.
gamma rays
E.
stars emitting fermions
ASTR101
Ch. 6 HW
Fall 2021
3
8.
Which of the following is always true about images captured with infrared telescopes?
A.
They are always displayed with the highest possible angular resolution.
B.
They are always useful for seeing through things.
C.
They are always displayed in false color.
D.
They are always displayed with north pointing upward in the images.
9.
Some telescopes are placed in space above Earth’s atmosphere primarily for which of
the following reasons?
A.
Some of the light being sent out from the telescopes can be blocked by Earth’s
atmosphere.
B.
Some of the light from objects is absorbed by Earth’s atmosphere.
C.
Astronomers want to observe continuous spectra from stars rather than
absorption spectra.
D.
Astronomers want to observe continuous spectra from the stars rather than
emission spectra.
10.
Imagine that you are the head of a funding agency that can afford to build only one
telescope. Which of the four proposed telescopes below would be best to support?
A.
a visible light telescope in Earth orbit
B.
An x-ray telescope located on a mountain in Chile
C.
A gamma ray telescope in Hawaii
D.
An ultraviolet telescope located in Earth orbit
11.
The stars in our sky twinkle in brightness and color because of
A.
turbulence in the Earth’s atmosphere.
B.
rapid changes in the brightnesses and colors of stars caused by changes in their
spectra.
C.
light pollution.
D.
the bubbling and boiling of gases on the surfaces of stars.
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ASTR101
Ch. 6 HW
Fall 2021
4
12.
Consider two future observatories in space. Observatory X consists of a single 50-meter
telescope. Observatory Y is an interferometer consisting of five 10-meter telescopes,
spread out over a region 100 meters across. Which observatory can detect dimmer stars,
and which one can see more detail in its images? (Assume all else is equal, such as quality
of optics, types of instruments, and so on.)
A.
Observatory Y can detect dimmer stars and Observatory X reveals more detail in
images.
B.
Observatory Y both detects dimmer stars and reveals more detail in images.
C.
Observatory X can detect dimmer stars and Observatory Y reveals more detail in
images.
D.
Observatory X both detects dimmer stars and reveals more detail in images.