Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Radiation Physics > Ch. 5 Book > Flashcards

Ch. 5 Book Flashcards

(78 cards)

Start Studying
1
Q

Electrons and protons are the ___ units of electric charge.

A

Smallest

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Electrostatics is the study of:

A

stationary electric charges

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Are both electrons and proton free to travel from the outermost shell of one atom to another?

A

No. Electrons are!

Protons on the other hand are fixed inside the nucleus of an atom and are not free to move

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

An object is said to be ___ if it has too few or too many electrons.

A

Electrified

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In what ways can electrification be created?

A

Contact
Friction or Induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

During a thunderstorm, wind and cloud movement can remove electrons from one cloud and deposit them on another, in what way was this Electrification created?

A

By induction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Unlike charges attract, like charges ____

A

Repel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

The magnitude of the electrostatic force is given by what law?

A

Coulombs Law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

The electrostatic force is very strong when objects are close, but decrease rapidly as objects separate.
This ____ relationship for electrostatic force is the same as that for x ray intensity.

A

Inverse Square

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Electric charges have ___ energy

A

Potential

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The unit of electric potential is the:

A

volt (V)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The higher the voltage, the ___ potential to do work.

A

Greater

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Electrodynamics is the study of:

A

electric charges in motion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is a conductor?

A

Any substance through which electrons easily flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Most metals are good electric conductors, _____ is one of the best.

A

Cooper

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Is water a good conductor?

A

Yes, because of the salts and other impurities it contains.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What’s an insulator?

A

Any material that does not allow electron flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is a semiconductor?

A

A material that under some conditions behaves as an insulator and in other conditions behaves as a conductor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

Increasing electric resistance results in a _____

A

Reduced electric current

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What is electric current measured in?

A

amperes (A)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

One ampere is equal to an ____

A

Electric charge of 1 C flowing through a conductor each second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Electric potential energy is measured in____

A

volts (V)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Electric Resistance is measured in:

A

ohms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Electric current is the:

A

flow of electrons through a conductor each

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
What is a direct current? What is an alternating current?
Direct: electrons flow in one direction along the conductor Alternating: current in which electrons oscillate back and forth
26
Electric Power is measured in:
watts (W)
27
Common household electric appliances, such as toasters, mixers, etc generally require ___ to ___ W of electric power.
500 to 1500
28
Any charged particle in motion creates a ____
magnetic field
29
The magnetic field of a charged particle such as an electron in motion is ____ to the motion of that particle.
perpendicular
30
The intensity of the magnetic field is represented by _____ lines
Imaginary
31
The electron spin created a magnetic field, which is neutralized in ____ pairs. Therefore, atoms that have a ____ number of electrons in any shell exhibit a very ___ magnetic field.
- Electron - Odd - Small
32
The imaginary lines of magnetic field are always ____ loops.
Closed!
33
The lines of magnetic field do not start or end as the lines of an electric field do. Such a field is called ____
dipolar , it always has a north and South Pole.
34
The small magnet created by the electron orbit is called:
a magnetic dipole
35
An accumulation of many atomic magnets with their dipoles aligned creates a ____ If all the magnetic domains are aligned, it acts like a ___
- Magnetic Domain - Magnet
36
Under normal circumstances, magnetic domains randomly distributed. True or False
True!
37
What is Magnetic Permeability?
the ability of a material to attract the lines of magnetic field intensity
38
What are the three principals types of magnets?
Naturally Occurring Artificially Induced Electromagnets
39
What an example of a natural magnet, artificially produced, and electromagnets?
- Earth - A Compass - Wire wrapped around an iron core
40
The intensity of the magnetic field is ___ to the electric current.
proportional
41
Diamagnetic materials:
are weakly repelled by either magnetic pole. (Not attached to a magnetic) Examples: Water and Plastic
42
Ferromagnetic materials include:
iron, cobalt, and nickel These are strongly attracted by a magnetic
43
Paramagnetic material:
Lie somewhere between ferromagnetic and nonmagnetic. They are very slightly attracted to a magnet and are loosely influenced by an external magnetic field.
44
The degree in which a material can be magnetized is its:
Magnetic susceptibility
45
Wood has ___ susceptibility Iron has a ____ susceptibility
Low High
46
Like magnetic poles ___, and unlike magnetic poles ____ .
- Repel - Attract
47
Ferromagnetic can be strongly ____
Magnetized
48
If the distance between two bar magnetic is halved, the magnetic force ___
Increases by four times
49
The SI unit of magnetic field is the:
Tesla
50
1 Tesla (T) = ______
10,000 gauss (G)
51
Does earth have a strong magnetic field?
No. Far less than the magnet on a cabinet door latch
52
Any charge is motion induces what?
a magnetic field
53
Does a charge at rest produce a magnetic field?
No. Electrons that flow through a wire produce a magnetic field about that wire.
54
A coil of wire is called a:
Solenoid
55
Magnetic field can be intensified further by ____ This device is called what?
Wrapping the coil wire around a ferromagnetic material such as iron. The iron core intensifies the magnetic field. - Electromagnet
56
What is an electromagnet?
current-carrying coil of wire wrapped around an iron core
57
To induce a current with the use of a magnetic field, what must happen?
The magnetic field cannot be constant but must be changing
58
Faradays Law The magnitude of the induced electric current depends on four factors:
1) Strength of the magnetic field 2) The velocity of the magnetic field as it moved past the conductor 3) The angle of the conductor to the magnetic field 4) The number of turns in the conductor
59
What is a prime example of electromagnetic induction?
Radio Reception
60
Intensity of the magnetic field at the wire must be ___ to induce an electric current. If the magnetic field intensity is constant, there will be ___ induced current.
- Constant - No
61
Varying magnetic field intensity induces an ____
Electric Current
62
An induction motor powers the rotating ___ of an x ray tube
Anode
63
Another device that used the interacting magnetic fields produced by changing electric currents is the:
Transformer
64
The transformer does not convert one from of energy into another but rather transforms…..
electric potential and electric current into higher and lower intensity
65
A ___ changes the intensity of alternating voltage and current.
Transformer
66
A transformer will operate only with a _____
changing electric current (alternating current)
67
A direct current (DC) applied to the primary coil will induce a current in the secondary coil. True or False
FALSE , NO current
68
The change in voltage is __ proportional to the ratio of the number of turns of the secondary coil.
Directly This means, if there are 10 turns on the secondary coil for every turn on the primary coil, the. The voltage generated in to secondary coil will be 10 times the folate supplied to the primary circuit.
69
The voltage change across the transformer is ___ to the turns ratio.
Proportional
70
Resistor Function:
Inhibits flow of electrons (Know the Symbol)
71
Battery
Provides electric potential Know the Symbol
72
Capacitor
Momentarily stores electric charge Know the Symbol
73
Ammeter
Measure electric current Know the Symbol
74
Voltmeter
Measure electric potential Know the Symbol
75
Switch
Turns circuit on or off by providing infinite resistance Know the Symbol
76
Transformer
Increases or decreases voltage by fixed amount (AC only)
77
Rheostat
Variable resistor Know the Symbol
78
Diode
Allows electrons to flow in only one direction Know the Symbol)l

Radiation Physics (12 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions