GS107Homework4_28July22(3)
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Rogue Community College *
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Course
107
Subject
Astronomy
Date
Dec 6, 2023
Type
docx
Pages
5
Uploaded by SuperHumanOxideBison32
Name:
Derek Greene
GS 107 Homework #4
Summer 2022
(10 points each for 50 total points)
1.
Multiple Choice
A. ____
A photon takes _______ to exit the core of the Sun.
a.
Less than 10 minutes
b.
Greater than 10 minutes but less than 10 months
c.
Greater than 10 months but less than 10 years
d.
Greater than 10 years but less than 10,000 years
e.
Greater than 10,000 years
B. ___
A neutrino takes _____ to exit the core of the Sun.
a.
Less than 10 minutes
b.
Greater than 10 minutes but less than 10 months
c.
Greater than 10 months but less than 10 years
d.
Greater than 10 years but less than 10,000 years
e.
Greater than 10,000 years
C.
___ Fusion is the process of _______ while fission is the process of
_____.
a.
Atoms merging into a new element, an atom breaking up into new
elements.
b.
An atom breaking up into new elements, atoms merging into a new
element.
c.
Stars merging into a new star, a star breaking up into new stars.
d.
A star breaking up into new stars, stars merging into a new star.
D. ___ Which of the following are units of energy?
a.
joules
b. newtons
c. watts
d. kilograms
E.
___ Which of the following are units of power?
a.
joules
b. newtons
c. watts
d. kilograms
1
2.
A gamma ray is a high energy photon.
Considering Step 2 of the proton-
proton chain, where does the gamma ray created here get its energy?
Diagrams and equation(s) will be helpful in providing a complete answer to
this question.
As the mass of 2H and 1H is less than 3He, the difference is converted into gamma
ray photons. This aligns with the principle that energy = mass times the speed of
light squared.
2
3.
Discuss how a star maintains a constant size (radius) when gravity wants to
compress it.
A star is able to maintain constant size as gravity compresses it due to the
counteracting force of the planet trying to expand due to increases in temperature
and pressure. When a star reaches a state of balance where it is neither
compressing nor expanding, it is in a state of hydrostatic equilibrium.
3
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4.
Polaris has an average magnitude of 1.98 while Betelgeuse has an average
magnitude of 0.7. On average, how much brighter is Betelgeuse than
Polaris?
4
5.
Explain the greater width of the spectra line for a rotating star compared to
one that is not.
The greater width of the spectra line for a rotating star is due to the doppler
effect. Light that moves towards us is shifted blue and light that is moving
away is shifted red. When a star is rotating, some of the spectrum is moving
away and some is moving towards us thus the reason for a greater width of
the spectra line.
5