06Ch_HW_Fall2021
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Montgomery College *
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Course
101
Subject
Astronomy
Date
Dec 6, 2023
Type
Pages
4
Uploaded by DukeField3370
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
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