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Astronomy Final Exam 3 Flashcards | StudBud
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Astronomy Final Exam 3
Astronomy Final Exam 3
50 terms
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#Astronomy #science #higher_education
Flashcards
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Questions
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Answers
1
The apparent magnitude is
how bright a star looks from 1 light-year
how bright a star is compared to the sun
how bright a star looks to us
how bright a star looks from Mars
2
What element marks the end of the fusion cycle?
Uranium
Plutonium
Lead
Iron
3
All of the energy that the Sun produces comes from the
radiation zone
core
convection zone
gravitational contraction
4
In order to become a black hole, a star must collapse and explode. The explosion is called a
thermonuclear explosion
Type II supernova
Type I supernova
coronal mass ejection
5
The point at which nothing can escape the gravitational pull of a black hole is called the event horizon.
True
False
6
21-centimeter radiation provides astronomers with information on interstellar molecular hydrogen gas.
False
True
7
The radius of the place around a black hole from where nothing escapes is called is called
the Nobel radius
the Hawking radius
the Swarzchild radius
the Einstein radius
8
A nova explosion is due to hydrogen fusion on the surface of a white dwarf.
False
True
9
We can tell that light has passed through a dust cloud because
the light appears redder
the light appears bluer
the light is Doppler shifted
the light looks dirty
10
One of the by-products of the proton-proton chain are these weird particles that can go through anything called
neutrinos
electrons
protons
neutrons
11
Stars and planets are formed when
explosions like the Big Bang happen
big clouds of gas are compacted by gravity
all the stars and planets that ever will be have already been formed
when a supernova happens
12
Visible light cannot escape from the event horizon of a black hole,high-energy radiation, such as gamma rays, can escape
False
True
13
The curved line where most stars spend their time on the H-R diagram is called
Stellar Parallax
The event horizon
The Main Sequence
The Luminosity Path
14
Sunspots are regions of intense magnetic fields.
True
False
15
A star of apparent magnitude +5 looks brighter than one of apparent magnitude -2.
True
False
16
Solar activity is important to us on the earth because
it can affect communication satellites
it really isn’t important to us
it indicates which days will give you worse sunburn
it tells is when to plant crops
17
The solar neutrino problem is the fact that astronomers observe too many neutrinos coming from the Sun.
True
False
18
Atomic hydrogen can be detected because
the atmosphere filters out all other radiation
atoms are bigger than molecules
the electrons stop spinning
the electrons switch their spin
19
According to the general theory of relativity, space is warped, or curved, by light.
True
False
20
As you go up on the y-axis on the H-R diagram
stars become hotter
stars become cooler
stars become dimmer
stars become bright
21
Sunspots appear dark because they are hotter than the surrounding gas of the photosphere.
False
True
22
What keeps a star like the Sun from collapsing?
neutrons pushing on each other
gravity
electrons pushing on each other
heat from fusion
23
A planetary nebula is the disk of matter around a star that will eventually form a planetary system.
False
True
24
Which seem to emit radiation in regular pulses?
Search light model
Lighthouse model
Strobe light model
Fire engine model
25
The interstellar medium is made up of matter in the form of gas and dust.
False
True
26
Nothing can travel faster than the speed of light.
False
True
27
What force is important in the contraction of a gas cloud into a star
gravity
“The Force” (Jedi Force)
nuclear force
electromagnetic force
28
What keeps a neutron star from collapsing?
gravity
electrons “pushing” on each other
neutrons “pushing” on each other
heat from fusion
29
The part of the Sun we see all the time is called the corona
False
True
30
On the H-R diagram, White Dwarves appear
in the lower right
in the lower left
in the upper left
in the upper right
31
The known laws of physics break down near the center of a black hole.
False
True
32
Sunspots are dark because
comets hit the Sun and they’re made of ice
magnetic fields hold down the heat at those spots
liquid metal floats on the surface of the Sun
meteorites hit the Sun and they’re made of iron
33
On the H-R diagram, Red Giants appear
in the lower left
in the upper right
in the lower right
in the upper left
34
The place around a black hole from where nothing escapes is called
the Cassinni Division
the Abyss
the Point of No Return
the Event Horizon
35
Matter accreting onto a black hole can emit X rays.
False
True
36
What part of the Sun can we only see during a solar eclipse?
Surface
Core
Corona
Radiation Zone
37
More massive stars evolve more slowly.
True
False
38
Heavy elements (heavier than iron) are produced
only by nuclear fission in the core of a star
only during the Big Bang
only by nuclear fusion in the core of a star
by nuclear reactions that take place in massive stars and supernovas
39
If the mass of a star is very large then it could possibly become a
Red Giant
White Dwarf
Neutron Star
Main Sequence Star
40
Another name for the proton-proton chain is
nuclear fusion
nuclear fishin’
nuclear fission
nuclear warhead
41
The H–R diagram can be a plot of temperature on the horizontal scale versus luminosity on the vertical scale.
False
True
42
Newly formed neutron stars have extremely strong magnetic fields.
True
False
43
Another name for the protostar phase in which the contracting gas cloud emits a large amount of solar wind is called
A Alpha phase
D Delta phase
G Gamma phase
T Tauri phase
44
As a cloud of gas contracts
it spins faster
it spins slower
it doesn’t change spinning speed
it reverses direction
45
If a star has a long lifetime, we can guess that
it is a high mass star
it is a neutron star
it is a black hole
it is a low mass star
46
Red giants are very bright because they are extremely hot.
True
False
47
The solar cycle is
Eight minutes
Twenty two years
One year
Five years
48
A brown dwarf is
a really tanned elf
a very bright star
a very large star
a failed star
49
A solar flare is a violent explosive event in a solar active region.
True
False
50
What is the energy source of the Sun?
hydrogen combustion
nuclear fusion
gravitational contraction
meteorite impacts
