GS107Homework3_24July22(3)
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Rogue Community College *
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Course
107
Subject
Astronomy
Date
Dec 6, 2023
Type
docx
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5
Uploaded by SuperHumanOxideBison32
Name:
Derek Greene
GS 107 Homework #3
Summer 2022
(10 points each for 50 total points)
1.
Multiple Choice
A. _
A
___
The focus (or focal point) of a simple lens is where . ..
a.
Parallel light rays (light rays from far away sources such as stars)
concentrate down to a single point.
b.
The lens is thickest.
B. _
C
__
Adaptive optics
a.
Are used to quickly change the magnification of a telescope.
b.
Are used to quickly change the resolution of a telescope.
c.
Are used to negate atmospheric blurring effects.
C.
_
B
__ What is the primary difference between a refracting and reflecting
telescope?
a.
A refracting telescope uses a mirror.
b. A reflecting telescope uses a mirror.
c.
A reflecting telescope has more chromatic aberration.
d.
They are two different terms for the same thing.
D. _
A
__ Like the Earth, the Sun has a magnetic field.
a. True
b. False
c.
Impossible to know.
E.
__
C
_ Which of these solar regions are furthest from the center of the
Sun?
a. photosphere
b. chromosphere
c. corona
d.
None of the above are solar regions.
1
2.
Telescopes can be a bit finicky and for those just beginning nighttime
viewing can be very frustrating.
A better first choice for viewing is a set of
good binoculars.
In addition to being easier to use, there may be people you
know who have one you can borrow.
(Hunters and birders often have good
binoculars.)
Binoculars specifications are given by magnification x
objective lens in mm.
For example, 10 x 50 is a 10 times magnification with
a 50 mm objective.
(It may seem greater magnification is always better but
if the lens isn’t big enough, all you get is a big fuzzy image.
A 10 x 25
would be a terrible choice at low light levels.)
Another good choice is
meeting up with others who a) have good telescopes and b) can calibrate
them for you so all you have to do is look through them.
http://www.orskywatchers.org/
is a good place to start.
Let’s compare some cheap binoculars to better ones.
I’ll be showing some
links at Amazon so you can look up more details but please don’t consider
this an endorsement of any particular choice.
Reviews such as
https://www.space.com/26021-best-binoculars.html
can help you get started.
Consider Example 6.1 for help on this one.
Setting up ratios will save you
time in calculations as well as less likely to make errors.
a.
How much more light gathering area does a 100 mm objective/aperture
lens
https://www.amazon.com/Orion-9326-25x100-Astronomy-
Binoculars/dp/B00066ELB2/ref=sr_1_13?
crid=LVH8JGQW4H5&keywords=astronomy+binoculars&qid=1658688
287&sprefix=astronomy+binocular%2Caps%2C180&sr=8-13
have
compared to a 25 mm one
https://www.amazon.com/Binoculars-
Waterproof-Binocular-Traveling-
Sightseeing/dp/B0756BXDTX/ref=zg_bs_297842_1/143-8947722-
1563215?pd_rd_i=B0756BXDTX&psc=1
?
Pi50^2= 2500pi
Pi12.5^2=156.25pi
2500pi/156.25pi= 16
100mm objective has 16 times more light gathering
area than a 25 mm one.
b.
How much more light gathering area does a 100 mm objective lens than a
35 mm one
https://www.amazon.com/Nikon-8244-ACULON-Binocular-
Black/dp/B00B7LQ5ZK/ref=pd_lpo_3?
2
pd_rd_i=B00B7LQ5ZK&psc=1
?
2500pi/(pi17.5^2)= 8.16326530612
times more light gathering area than a 35 mm objective.
c.
How much more light gathering area does a 100 mm objective lens than
a 50 mm one
https://www.amazon.com/Binoculars-Adults-Watching-
Waterproof-Smartphone/dp/B095KH2TNY/ref=zg_bs_297842_22/143-
8947722-1563215?pd_rd_i=B09H76NSC5&psc=1
?
2500pi/(pi25^2)= 4 times more light gathering area than a 50 mm objective.
d.
How much more light gathering area does a 100 mm objective lens than a
70 mm one
https://www.amazon.com/Celestron-SkyMaster-Binoculars-
Tripod-Adapter/dp/B00008Y0VN/ref=sr_1_8?
crid=LVH8JGQW4H5&keywords=astronomy+binoculars&qid=1658690
272&sprefix=astronomy+binocular%2Caps%2C180&sr=8-8
?
2500pi/(pi35^2)= 2.04081632653 times more light gathering area than a
70 mm objective.
3
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3.
Describe the properties of coronal mass ejections and their potential impact
on the functioning of the modern world (flight navigation, communication,
etc.).
Coronal mass ejections or CMEs are “large expulsions of plasma and
magnetic field from the Sun’s corona” (NOAA). CMEs have the potential to
disrupt radio transmissions and to increase interference. Additionally, CMEs
can disrupt GPS and render modern navigational technology useless.
4. The density of the Earth is about 5.51 g/cm
3
(Earth is mostly melted rock,
to oversimplify geology) while the Sun’s is 1.41 g/cm
3
.
https://openstax.org/books/astronomy/pages/15-1-the-structure-and-
composition-of-the-sun
Explain how the gravity on the surface of the Sun
can then be so much greater (~28 times as much) than that of the Earth.
The amount of gravity a planet has is based on its mass not its density. As
the sun has more mass than the earth, it has more gravity.
5.Describe the Zeeman effect and what it tells us about the Sun.
“The Zeeman effect is the splitting of spectral lines into several closely spaced
lines due to the presence of a sunspot's magnetic field. The magnitude of the
splitting tells us the strength of the local magnetic field on the Sun” (BCIT).
4
Works Cited
NOAA. “Coronal Mass Ejections.”
Coronal Mass Ejections | NOAA / NWS Space Weather
Prediction Center
, www.swpc.noaa.gov/phenomena/coronal-mass-
ejections#:~:text=Coronal%20Mass%20Ejections%20(CMEs)%20are,magnetic%20field
%20(IMF)%20strength. Accessed 2 Aug. 2023.
BCIT, BCIT. “Library.”
BCIT
, 7 Nov. 2022, www.bcit.ca/library/.
5