Logan Bell- Assessment 3
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Central Michigan University *
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111
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Astronomy
Date
Apr 3, 2024
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docx
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Uploaded by MateMorningPanther30
Logan Bell
AST 111
Unit 3 Assessment
Chapter 15 Questions
1.
Fill in the blank
About ____of the Sun’s mass is hydrogen, and another 25% is helium.
Answer: 73% (Chapter 15, section 15.1)
2.
All the following are abundant gasses in the Sun’s visible surface layer except which one?
a. Oxygen
b. Carbon
c. Chlorine
d. Iron
Answer: Chlorine (Chapter 15, section 15.1)
3.
Fill in the blank
The hottest part of the solar atmosphere is called ___.
Answer: Corona (chapter 15, section 15.1)
Chapter 16 Questions
4.
True/False
Is it true that Earth and the solar system are roughly 4.5 billion years old.
Answer: True (Chapter 16, section 16.1)
5.
Fill in the blank
The convection zone extends about___ of the way from the Sun’s surface to its center.
Answer: 30% (section 16.4)
6.
Where does the fusion of hydrogen occur in the sun?
a.
The top of the sun
b.
The bottom of the sun
c.
In the center of the sun
d.
Around the sun
Answer: In the center of the sun (Section 16.3)
Chapter 17 Questions
7.
What is the most important characteristic of a star? a. The brightness
b. The size
c. The distance
d. The luminosity
Answer: The luminosity (section 17.1)
8.
Fill in the blank
____ at its brightest is of magnitude 4.4.
Answer: Venus (section 17.1)
9.
The difference between the magnitudes of a star or other object measured considering two different spectral regions is called what?
a.
Color index
b.
Magnitude
c.
Space velocity
d.
Proper motion
Answer: Color index (section 17.2)
Chapter 18 Questions
10. Fill in the blank
The ____ Way Galaxy is about 100,000 light years in diameter.
Answer: Milky (section 18.1)
11. True/False
Is it true or false that a binary star system in which both stars can be seen with a telescope
is called a spectroscopic binary?
Answer: False, it is a Visual Binary (section 18.2)
12. The diameters of stars can be determined by measuring the time it takes an object to what?
a.
To pass behind it and block its light
b.
To pass in front of it and block its light
c.
To pass underneath it and block its light d.
To pass above it and block its light
Answer: To pass in front of it and block its light (Section 18.3)
Chapter 19 Questions
13. Fill in the blank
In 1960 the official definition of the ___ was changed again.
Answer: Meter (Section 19.1)
14. The apparent change in direction of the remote object due to a change in vantage point of the observer is called what?
a.
Parallax
b.
Baseline
c.
Triangulation
d.
Distance Answer: Parallax (Section 19.2)
15. True/False
Is it true that Cepheids and RR Lyrae stars are two types of pulsating variable stars?
Answer: True Statement (Section 19.3)
Chapter 20 Questions
16. What do astronomers refer to as all the material between stars?
a. Interstellar medium
b. Interstellar matter
c. Nebula
d. Interstellar dust
Answer: Interstellar matter (Section 20.1)
17. Fill in the blank
The first evidence for absorption by interstellar clods came from the analysis of a _____.
Answer: Spectroscopic Binary Star (Section 20.4)
18. About what percentage of visible matter in the galaxy is in the form of gas and dust?
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a.
3%
b.
15%
c.
50%
d.
100%
Answer: 15% (Section 20.1)
Chapter 21 Questions
19. True/False
Is it true or false that the most massive reservoirs of interstellar matter are the giant molecular clouds?
Answer: True (Section 21.1)
20. Fill in the blank
Most stars form in giant molecular clouds with ____ as large as 3 x 10^6 solar _____.
Answer: Masses (Section 21.1)
21. A planet orbiting a star other than our sun is called what?
a.
Super earth
b.
Herbig Haro object
c.
Exoplanet
d.
Neptune
Answer: Exoplanet (Section 21.5)
Chapter 22 Questions
22. The number of years a star remains in the main-sequence band depends on its what?
a.
Its mass
b.
Its density
c.
Its size
d.
Its luminosity
Answer: Its mass (Section 22.1)
23. True/False
Is it true or false that Globular clusters were given this name because they are nearly symmetrical round systems of hundreds of thousands of stars?
Answer: True (Section 22.2)
24. Fill in the blank
In stars with masses higher than about___solar masses, nuclear reactions involving carbon, oxygen, and still heavier elements can build up nuclei as heavy as iron.
Answer: 8 (Section 22.5)
Chapter 23 Questions
25. The maximum mass that a star can end its life with and stull become a white dwarf is called the what?
a.
Chandrasekhar limit
b.
Degenerate star
c.
A star in crisis
d.
Masses
Answer: Chandrasekhar limit (Section 23.1)
26. Fill in the blank
A supernova occurs on average___ every 25 to 100 years in the Milky Way Galaxy.
Answer: Once (Section 23.3)
27. True/False
Is it a true statement that gamma-ray bursts last from a fraction of a second to a few hours?
Answer: False, it lasts from a fraction of a second to a few minutes. (Section 23.6)
Chapter 24 Questions
28. What is a region in spacetime where gravity is so strong that nothing, not even light, can escape?
a.
Gravitational wave
b.
Black hole
c.
Spacetime
d.
Galaxy Answer: Black hole (Section 24.5)
29. By considering the consequences of the equivalence principle, what did Einstein conclude?
a.
That we live in a round spacetime
b.
That we live in a infinite spacetime
c.
That we live in a curved spacetime
d.
That we live in a rectangular spacetime
Answer: that we live in a curved spacetime (Section 24.2)
30. Fill in the blank
General relativity predicts that the ____the gravity, the more slowly time must run.
Answer: Stronger (Section 24.4)
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