GS107Homework2_18June22(3) (1)
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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 #2 Summer 2022
(10 points each for 50 total points)
1.
Multiple Choice
A. ____ The Earth’s orbit around the Sun depends strongly on Earth’s mass.
a.
True
b. False
c. Impossible to tell with the information given in Chapters 1-3.
B. ___ The Moon’s orbit around the Earth depends strongly on the Earth’s mass.
a.
True
b. False
b.
Impossible to tell with the information given in Chapters 1-3.
C.
__A photon with a larger wavelength has more energy than one with a smaller wavelength.
a.
True
b. False
c. Impossible to tell with the information given.
D. ___ A photon with a larger frequency has more energy than one with a smaller frequency.
a.
True
b. False
c.
Impossible to tell with the information given.
E.
___ What is the luminosity of a star with half the temperature and three times the radius of the Sun?
a.
20.25 times as much
b.
56.25% as much
c.
1.5 times as much
d.
66.67% times as much
F.
1
2.
How many times larger is the force of gravity between the Earth and the Sun
than Mars and the Sun? (Hint: You’ll need to look up some mass and orbit data here from an appendix in our text. https://openstax.org/books/astronomy/pages/f-physical-and-orbital-data-for-
the-planets
)
2
3.
What would the period be between an Earth-like planet 2.25 AU away from a star 1.75 times the mass of the sun (1.75 solar masses)? You may treat the orbit as circular.
3
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4.
Using the blackbody interactive at PhET (
https://phet.colorado.edu/en/simulation/blackbody-spectrum
), what is the color for objects at temperatures of a) 4000 K, b) 5000 K and c) 6000 K? (This is necessarily somewhat qualitative. Someone might describe a color as yellow-green and someone else as green-yellow.) Using Wien’s Law, what is the maximum wavelength for each of the objects listed above? Use the interactive to check your work. Note that Wien’s Law is a simple approximation to the full blackbody probability distribution so will not give exactly the same answer but it should be close-ish.
4
5.
How do astronomers tell which elements are in space/stars/interstellar gas/etc.?
By observing the light emitted or absorbed in space through telescopes. This information is then compared to known spectrum patterns to determine which elements are present and how fast objects are moving. This is all possible due to the nature of light and specifically how each element emits a different and specific wavelength of light.
5