Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
38 Cards in this Set
- Front
- Back
Science that deals with occurrences n nature embracing mechanics, heat, light, sound electricity and magnesium and the structures and properties of matter
|
Physics
|
|
Two or more substances combined
|
Mixture
|
|
Simple substance can not be decomposed into simpler substance by ordinary means
|
Element
|
|
Smallest subdivision or an element
|
Atom
|
|
Complex substances, Chemical union of 2 or more eleements in definite composition
|
Compound
|
|
Smallest subdivision physical properties of the compound
|
Molecule
|
|
What is actual or potential ability to do work
|
Energy
|
|
What are the two types of mechanical energy
|
Kinetic- Motion energy
Potential- Stored energy |
|
What are the names of the other 5 types of energy
|
heat
chemical electrical; nuclear electromagnetic |
|
What are the laws of conservation
|
Energy can never be created or destroyed.
Total amount of energy in the universe is constant Energy will flow from a higher to lower level in the absence of outside work |
|
Atoms with the same atomic number but different atomic weight are called
|
Isotope
|
|
What is the difference between the element
|
A different number of neutrons
|
|
Addition or removal of an electron from an atom resulting in the formation of an ion pair is called
|
Ionization
|
|
When an x-ray photon enters the atom and knock it out of its orbit forming an ion pair is called
|
X-ray Bombardment
|
|
What type of ionization is called boiling off of electrons on the filament
|
Thermionic Emission
|
|
What are the two types of ionization that we are most concern with in radiology
|
X-ray Bombardment and Thermionic Emossopm
|
|
What are the other 4 types of ionization
|
electron Stream Bombardment
spontaneous breakdown of Radioactive material Light Ray bombardment of certain materials Chemical Ionization |
|
When dealing with the electromagnetic spectrum. What does the velocity equal to.
|
The speed of light define wavelength and frequency
Wavelength is the distance between two successive point on a wave and frequency is the number of waves that pass in a particular time fram |
|
What is Science
|
Organized and classified knowledge
|
|
List the 12 properties of X-rays
|
Highly penetrating invisible x-rays
Electrically neutral Poluenergentic and heterogenous Release very small amounts of heat Travel in straight lines and at speed of light. Can ionize matter Cause flurorescence of certain crystals Cannot be focused by a lens Affect photgraphic film Produce chemical and biological changes in matter through ionization and excitation Produce secondary and scatter radiation. |
|
What are the 3 types of magnets
|
natural
permanent electromagnet |
|
What are the laws of magnetism
|
Repulsion-Attraction - like poles repel and unlike poles attac
Inverse square law - Force of attraction between to magnetic poles varies directly as the strength of the poles and inversely as the square of the distance between them Magnetic poles - Two poles have a North and South |
|
What is Magnetic Induction
|
Non magnetized iron is brought near one pole of magnet, the end of the iron nearest the pole assumes the opposite polarity
|
|
What is permeablility and retentivity
|
something high permeable (easily attractive will lose it magnetism quickly. Something that is not easily permeable will retain its high retentivity
|
|
What is electromagnetism
|
Creating magnetism thru electricty
|
|
What is Electromagnetic Induction
|
Creating electricity thru magnetism
|
|
what is electrostatic
|
the study of distribution of fixed charges or electrons at rest
|
|
What are the laws of electrostatic
|
Like charges repel and unlike charges attract
electrical charges reside only on the external surface of the conductor Concentration of charges are greater on the curved surface where the curvature is greatest Only negative electrons move in a solid conductor Inverse square law applies |
|
What is electrification
|
Objects can be electrified (charged)
|
|
What are the 3 methods of electrification
|
1. Electrification by friction- Removal of electrons from one object by rubbing it with another of a different kind.
2. Electrification by contact- A charg object confer the same kind of charge on any uncharged body which it comes into contact 3. Electrification by Induction- The charged body confers the opposite kind of charge on the metallic body which is in its field |
|
Electrons that are moving predominately in the same direction are often referred ta as electric current. What is this
|
Electrodynamics
|
|
What are the conditions under which charges flow
|
vacuum - Space that air has been removed
gases - Will promote a drift of electrons from a negative to a positive electrode ionic solutions - Causes electrons to migrate to positive or negative poles during electrolysis metallic conductors - Pathway provided for the movement of electrical current |
|
What are semiconductors
|
The ability to conduct under certain conditions and insulate under others
|
|
What are the factors on an electrical current
|
1. Quantity or amount of electrons flowing
2. One amphere is one coulomb of electrical charge flowing per second 3. The number of electrons available on the filament (cathod) to produce x-ray photon |
|
What is EMF
|
Electromotive Force- Is the total maximum difference of potential between the positive and negative ends of the electron force
|
|
What is resistance = Ohms
|
The amount of opposition to the current in the circuit is called the resistance
|
|
What are the factors affecting resistance
|
1. Types of conductors
2. Length of conductor 3. The cross-section of the conductor 4. The temperature of the comductor |
|
What are series in a circuit
|
All the resistances are connected in a row, one after another
|