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Chp. 3, 11
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Lecture 11
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1. Which photon has the highest energy?
a. ultraviolet
b. visible
c. x-ray
d. infrared
e. radio
2. Which photon has the longest wavelength?
a. ultraviolet
b. visible
c. x-ray
d. infrared
e. radio
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3. Rank the following types of radiation is order of
increasing 1) wavelength, 2) frequency, and 3)
energy:
microwave, visible, x-ray, radio, gamma ray, infrared
A) gamma ray, x-ray, visible, infrared, microwave
microwave, infrared, visible, x-ray, gamma ray
microwave, infrared, visible, x-ray, gamma ray
B) microwave, infrared, visible, x-ray, gamma ray
gamma ray, x-ray, visible, infrared, microwave
gamma ray, x-ray, visible, infrared, microwave
C) gamma ray, x-ray, visible, infrared, microwave
microwave, infrared, visible, x-ray, gamma ray
gamma ray, x-ray, visible, infrared, microwave
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Lecture 12
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4. Stars emit radiation very much like a perfect
blackbody. Our Sun has a surface temperature of
approximately 6000 degrees Kelvin. At what
wavelength does the Sun emit most of its
radiation?
a) 6000 nm
b) 1.8 ×1010 nm
c) 1.5×109 nm
d) 0.002 nm
e) 500 nm
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5. When something is what we usually call “red
hot”, it is hotter than something that is
a) “blue” hot
b) “white” hot
c) neither of these
d) both of these
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Lecture 13
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6. The Earth’s atmosphere is opaque to the
________ part of the electromagnetic
spectrum:
a)
b)
c)
d)
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Visible
X-Ray
All of the above
None of the above
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7. Which of the following statements is true with
regards to Blackbody radiation?
a) A blackbody emits relatively more energy at
longer wavelengths as it heats up.
b) A blackbody emits energy at all wavelengths
c) The shape of the blackbody spectrum depends
on what the source is made of.
d) All of the above
e) None of the above
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8. Which transitions were responsible for each of
these absorption lines?
a) A: 1-2 B: 2-4 C: 1-4
b) A: 1-4 B: 2-4 C: 1-2
c) A: 4-1 B: 4-2 C: 2-1
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9. Two stars orbiting one another. The diagram
shows the orbital motion of one of the stars, and
four different positions are marked (A, B, C, D).
At which position is the light from the star
redshifted? blueshifted? not shifted at all? D
a) A, C, B/D
b) C, A, B/D
c) B, D, A/C
A
d) D, B, A/C
B
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C
Lecture 14
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10. Emission and Absorption lines are produced
when _____ interact with _____.
a) protons, electrons
b) neutrons, protons
c) neutrons, photons
d) electrons, photons
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11. An incandescent bulb, fluorescent light, and the
Sun emit ________, ________, and _________
spectra, respectively.
a)
b)
c)
d)
e)
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Continuous, emission, absorption
Continuous, absorption, emission
Continuous, continuous, continuous
Absorption, emission, continuous
Absorption, emission, absoprtion
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Lecture 15
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12. Two stars orbiting one another. The diagram
shows the orbital motion of one of the stars, and
four different positions are marked (A, B, C, D).
At which position is the light from the star
redshifted? blueshifted? not shifted at all?
A
a) A, C, B/D
b) C, A, B/D
c) B, D, A/C
d) D, B, A/C
D
C
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B
13. Which of the following statements about the
Sun’s atmosphere is false?
a) The chromosphere is the region in which
the colors producing white light are generated.
b) The photosphere is where most of the
photons escape into space
c) The corona consists of very low density
gas
d) The temperature of the corona is higher
than the temperature of the Sun’s “surface”.
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Lecture 16
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14. The Sun produces its energy from
a) Electric currents generated in its core
b) Chemical reactions (oxidation reactions)
producing flames
c) Fusion of hydrogen into helium
d) Disintegration of helium into hydrogen
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15. About how many years elapse between times
of maximum solar activity?
a) 30
b) 11
c) 22
d) 1
e) None of the above.
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16. The Butterfly Diagram plots
a) Number of sunspots as a function of time
b) Number of sunspots as a function of
magnetic field strength
c) Rotation rate as a function of latitude
d) Sunspot latitude as a function of time.
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17. Which of the following about the sunspot cycle
is not true?
a) The number of spots rises and falls every
11 years.
b) The pattern of the magnetic polarity of the
spots repeats every 22 years.
c) spots are located in regions of high
magnetic activity
d) spots are more readily seen near the
rotational poles of the Sun where magnetic field
lines are concentrated
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Lecture 17
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18. The Maunder Minimum refers to
a) Times of low solar activity that occur every 11
years.
b) Times of low solar activity that occur every 22
years
c) The region in the solar atmosphere where the
temperature is lowest.
d) An extended period of time in the 1600’s
during which the Sun had anomalously low
activity levels.
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19. The Sun’s activity cycle is a result of:
a) Magnetism and Differential Rotation
b) Gas Pressure and Differential Rotation
c) Coupling of the magnetic field of the Earth
and Sun.
d) Global Warming
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20. What’s missing?
1H+1H2H+e++
e
2H+1H3He+
3He+3He
4He+21H
?
a)
b)
c)
d)
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1H
2H
3He
4He
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Miscellaneous
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21. Sunspots are
A. regions where the gas is considerably cooler (by
as much as 1500 K) than the surroundings.
B. regions where the gas is considerably hotter than
the surroundings.
C. regions where the magnetic field is stronger.
D. both a and c.
E. both b and c.
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22. The four hydrogen nuclei which are fused
together are more massive than the helium
nucleus which they make. What happens to the
missing mass?
A. It is converted to energy.
B. It is ejected from the star in flare activity.
C. It reappears later as neutrinos.
D. It is re-supplied to the Sun by meteoroid
impacts.
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23. In the proton-proton chain, how many
protons are required to make a helium
nucleus?
A. 4.
B. 2.
C. 3.
D. 5.
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24. Which of the following statements about solar
neutrinos is not true?
A)They are produced by the proton-proton chain
B)Their interaction with matter is extremely weak
C)They carry electric charge
D)They provide information about the solar interior
E)They carry energy.
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25. The energy emitted by thermonuclear
processes in the core of the Sun takes thousands
or even millions of years to emerge from the
surface because
a) it is circling in the gravitational field of the
Sun
b) it loses energy due to convection,
conduction, and radiation
c) of the Sun’s enormous radiation
d) it is absorbed and re-emitted countless
times along the way.
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26. The temperature in and around the Sun
a) drops continuously as you move outward
b) rises continuously as you move outward
c) drops as you move from the center to the
photosphere, then rises above the
photosphere.
d) increases as you move from the center to
the photosphere, then drops above the
photosphere.
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1.
2.
3.
4.
A. Filtered optical (H emission); plages; chromosphere
B. Unfiltered light; optical; sunspots; photosphere
C. UV emission; coronal holes, prominences; corona
D. X-Ray emission; coronal holes, prominences; corona
1. B 2. A 3. D 4. C
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Answer Key
1. C 2. E 3. A 4. E 5. C 6. B 7. B 8. B 9. C 10. D
11. A 12. A 13. A 14. C 15. B 16. D 17. D 18. D 19.
A 20. C 21. D 22. A 23. A 24. C 25. D 26. C
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