Exam 2 Flashcards
1
Q
Recent reports discussing the population bomb…
A
Indicate that the explosion is slowing
2
Q
A one-kiloton nuclear weapon, exploded at ground level, would destroy…
A
About 1 square kilometer of a city
3
Q
For an atomic bomb, the number if doublings required is closest to…
A
80
4
Q
An implosion type bind is required for…
A
A Pu-239 bomb
5
Q
Which of the following does not represent exponential growth?
A
illness from anthrax
6
Q
The statement that Chernobyl accident will kill 24,000 people is based on…
A
The linear hypothesis
7
Q
A moderator is something that…
A
Slows neutrons
8
Q
The dangerous radioactivity in fallout comes from…
A
Fission fragments
9
Q
Fallout is much worse if the bomb…
A
Is exploded near the ground
10
Q
A nuclear reactor cannot explode like a nuclear bomb because…
A
The nuclear reactor depends on slow neutrons
11
Q
According to the text, the least bad place to put nuclear waste is…
A
Underground
12
Q
A breeder reactor is designed to produce…
A
Plutonium
13
Q
The number of nuclear weapons that the United States had was closest to…
A
Ten thousand
14
Q
PCR has been used to (choose all that are appropriate)
A
(ALL OF THEM) A. Identify children of Thomas Jefferson B. Check the guilt of convicted murders C. Identify the victims of 9/11 D. Identify the fathers of children
15
Q
The Hiroshima bomb used…
A
A gun design
16
Q
If the water moderator is lost from a nuclear reactor…
A
The chain reaction will increase, causing a reactivity accident
17
Q
The material that might be “reprocessed” from nuclear waste is…
A
Pu-239
18
Q
Which of the following is not a good example of the doubling law?
A
Future population growth
19
Q
The Canadian Candu reactors use…
A
Deuterium
20
Q
Plutonium can explode with fewer generation than can uranium because…
A
Plutonium fission releases more neutrons
21
Q
In a nuclear power plant, the material that runs through the turbine is…
A
Stream
22
Q
The number of deaths from the Nagasaki bomb is estimated to be…
A
50,000 to 150,000
23
Q
The smallest container that could contain one critical mass of plutonium is…
A
A coffee mug
24
Q
The bomb dropped on Hiroshima used as its fuel…
A
Uranium
25
Saddam Hussein planned to enrich uranium using...
Calutrons
26
A centrifuge enrichment plant takes an area of about...
One large classroom
27
PCR involves...
DNA
28
One of the most dangerous radioactive materials from fallout is...
Sr-90
29
The term China syndrome refers to...
Meltdown of nuclear fuel
30
Depleted uranium is a useful substance because...
An artillery shell made from it is very penetrating
31
PCR was used to learn about...
Descendants of Sally Hemmings
32
Another name for the H-Bomb is
Thermonuclear bomb
33
A nuclear explosion similar to the one produced by North Korea would destroy an area of about....
The size of a college campus
34
Cold fusion...
Has been seen in laboratory experiments
35
At Three Mile Island (choose all that are correct)
Some of the uranium fuel melted
36
What distinguishes a breeder reactor from other reactors is that...
It makes more fuel than it uses
37
Jupiter is not a star because...
It isn't massive enough
38
Current is measured by...
Amps
39
A volt is measure of...
Energy per electron
40
Magnetism comes from...
Moving electric charge
41
In a permanent magnet, the magnetism comes from:
The spin of the electron
42
Magnetic monopoles...
Have never been found
43
Rail guns push the projectile using...
Magnetic fields
44
Tesla wanted to use a transformer to distribute electricity because...
It deceased the current going through line wire to reduce the loss of electricity
45
You can demagnetize a natural magnet...
By heating it above the Curie point
46
What discovery now allows for headphones to be small and light?
Rare-earth magnets, such as samarium cobalt
47
Which of the following use or consist is permanent magnets? (choose all that apply)
Transformers
48
Theoretically, the Earth should not have permanent magnet in its core because...
It's interior is too hot
49
The Earth's magnetism comes from...
Iron in the crust
50
The Earth flips its magnetism, on average, approximately...
Twice every million years
51
The north geographic pole of the Earth...
Is a south magnetic pole
52
Compasses point north because...
There are electric currents in the iron core of the earth
53
Electricity will heat a wire if it has...
High current
54
Static electricity occurs when two surfaces rub against each other and...
Electrons flow from one to another
55
Europe uses higher voltage in homes because it...
Creates less heat in home wiring
56
Lights and TVs in Europe tend to flicker because Europe uses...
50 hertz- the United States uses 60 Hertz
57
When an object loses some electrons, it...
Has a positive charge
58
To get a spark, you normally need:
High Voltage
59
A fuse is used in a house to prevent...
House wires from overheating
60
The Earth's magnetic flips are used for...
Geologic dating
61
In a metal, electrons...
Can move freely
62
The aspect of electricity that would make it most dangerous is high...
Current
63
A certain kind of generator uses its own electricity to strengthen its magnetic field. Such a generator is called a...
Dynamo
64
The original superconductors were cooled with...
Liquid Helium
65
Room-temperature superconductors...
Have no practical applications
66
High-temperature superconductors operate at approximately:
-123 C (liquid nitrogen temperature)
67
We use AC instead of DC because...
AC can use transformers
68
Topsy was executed with AC...
To show the dangers of high voltage
69
Edison wanted...
A power plant on every city block
70
The current through a flashlight bulb is...
About one AMP
71
A stereo speaker produces sound by the force...
Of a magnetic field on an electric charge
72
The light from an ordinary light bulb comes from the fact that...
The wire is heated by electricity
73
A Tesla coil is a kind of...
Transformer
74
Submarines can be detected by their...
Magnetism
75
At the Curie temperature...
Magnetism disappears
76
Most electric power is generated by...
A wire moving through a magnetic field
77
What invention made it possible to charge low voltage AC to high voltage AC?
Transformer
78
To reduce losses from resistance, electric power lines use...
Very high voltage
79
An example of a transformer is...
A Tesla coil
80
Better motors and earphones have recently been made possible by...
Stronger magnets
81
Beats measure...
The difference between two frequencies
82
Waves tend to bend in to the side...
With slower wave velocity
83
The fastest earthquake wave is...
P Wave
84
The slowest earthquake wave is...
L Wave
85
An octave refers to two frequencies that differ by a factor of...
2
86
When two different waves pass through an opening of the same size, which one will spread more?
Larger Wavelength
87
The fastest sound wave is:
They all travel at the same speed
88
You can measure the distance to the epicenter by measuring...
The time between the P and S waves
89
Sound travels faster in...
Rock
90
When an opening gets smaller, a wave that passes through it...
Spreads more
91
The very center of the earth is...
Solid iron
92
Which kind of earthquake wave is purely longitudinal...
P Wave
93
Which of the following statements about earthquakes is true?
P waves are fastest, and L waves cause the most destruction
94
The L wave is often the most damaging because...
It stays on the surface, so it doesn't spread out very much
95
An earthquake wave does its most damage when it reaches an area that...
Slows it down
96
Landfill is dangerous because...
The amplitude of the earthquake increases.
97
When there is an atmospheric inversion, sound tends to...
Bend downward
98
The ocean sound channel...
Is very quiet
99
Sound tends to bend toward the side with...
Colder air
100
The same note is played on two pianos. Beats are heard once per second. From this, we deduce that...
At least one of the pianos is out of tune
101
We know that the inner part of the Earth is liquid because...
No S waves move across it
102
A magnitude 9 earthquake, compared to a magnitude 8 earthquake...
Has 10 to 30 times more energy
103
You feel the tremors of an earthquake. Ten seconds later, you feel another shaking. The distance to the epicenter is about...
50 miles
104
If we double the frequency of sound, the wavelength is...
Halved
105
Beats demonstrate that...
Sound is a wave
106
The velocity of sound is approximately...
1000 feet per second
107
The speed of sound in air...
Increases as temperature increases
108
Sound waves are...
Compressional (longitudinal)
109
On a typical day, sound emitted near the ground tends to bend...
Upward, toward the sky
110
You are more likely to hear distant sound when...
The air near the ground is cool and the air above is also cool
111
Because of evaporation, the air above the surface of a lake becomes cool. Sound in the air above the lake will tend to...
Bend downward towards the surface
112
To have a sound channel, there must be...
A minimum in the velocity of sound
113
SOFAR took advantage of...
The sound channel in the ocean
114
Water waves are...
Both transverse and longitudinal
115
The sound channel in the ocean carries sound a long distance because...
The sound doesn't spread out in the up and down directions
116
As you travel deeper into the ocean, the water temperature...
First gets cooler, than warmer
117
A pianist plays two keys: middle C, and the C above middle C (i.e., an octave higher). The speed of sound for the higher frequency, compared to that for the lower frequency, is (careful, this may be a trick question)...
The same
118
As you move to a higher altitude, the temperature of the air...
First gets cooler, then warmer
119
The atmospheric sound channel would not exist, if not for...
ultraviolet light
120
The ozone layer is created by...
Sunlight
121
SOSUS refers to...
A system for detecting submarines
122
Which of the following statements was true about Project Mogul?
It was concerned with the atmosphere
123
According to this text, the flying disks that crashed near Roswell were...
Microphones
124
Very long wavelengths water waves...
Travel faster than short ones
125
Whales and fiber optics both make use of what principle...
Huygens
126
When an earthquake at sea starts a tsunami or tidal wave, the initial height is relatively small. What accounts for the towering wave that breaks near the shore...
The wave moves slower
127
A water wave has a wavelength of 10 meters and a frequency of 2 cycles/sec.
20 meters per second
128
The sound from a passing car sounds like a high pitch, but as it passes, it gets lower. That's an example of...
The Doppler shift
129
Thunderclouds tend to rise until...
They reach air that is warmer than they are
130
The atmospheric sound channel is created because of...
Ultraviolet light
131
In the daytime, sound tends to...
Bend upward
132
Most damage from an earthquake usually from the...
L wave
133
For sound waves, low-frequency waves travel...
The same speed as the high frequency
134
The piano note A above the middle C is 440 Hz. The next higher A has a frequency...
880
135
Moore's Law relates to...
Computer chip capability
