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rte1418

Physics

QuestionAnswer
matter anything that occupies space and has form or shape
Mixture when two or more substances are combined
atom the smallest unit of an element
law of conservation matter and energy cannot be created or destroyed but can be converted from one form to another and remains constant
3 subatomic particles Protons,neutrons & elctrons
atomic number the number of elctrons equals teh numver of protons
atomic mass the nomber of prons plus the number of neutrons in the neucleus of an atom
6 types of energy mechanical,chemical,electrical,thermal,nuclear, electromegnetic
what is unique about electromagnetic waves they require no medium and can travel in a vacuum
wavelength the distance between any two successive points on a wave
frequency the number of waves that passes a particular point given in a time frame
amplitude the intensity of the wave defined by its maximal height
what is the relationship between frequency and wavelength they are inversely proportional
octes rule the number of electrons in the outermost shell never exceeds eight electrons
photon an atom of light/bundle of energy
what is the speed of light 186,400 m/s
what is the unit of measure for frequency the Hertz (Hz)
3 regions most important to radiologic technology on the elctromagnetic spectrum visible light, x-radiation & radiofrequency
what is the relationship between energy and frequency they have a direct relationship
what is significant about electromagnetic radiation vs. ultrasound ultrasound is not part of the spectrum and requires matter
whats the major difference between x and gamma rays thre origin, x are produced outside the nucleus & gamma are produced inside the nucleus of a radioactive atom
what is the primary function of an x-ray imaging system to convert electric energy into electromagnetic energy
electrostatics the study of staionary electric charge
electrons teh smallest unit of electric charge
coulomb the fundamental unit of electric charge
4 laws of electrostatics 1. unlike charges attrack, like charges repel2. coulomb law3.electric charge distributes in uniform throughout surface4. elctric sharge is a conductor and is concentrated on the sharpest point
volt (V) the unit of electric potential
electrodynamics the study of electric charges in motion
conductor any substance through which electrons flow easily
insulator any material that doesnt allow electrons to flow
semiconductor a material that under some conditions behaves as an insulator and in others as a conductor
Ohm's law the voltage across the total circuit or any portion of the circuit is equal to the current times the resistance
direct current electrons that flow in one direction
alternating current electrons that flow in opposite directions
watts how electric power is measured
any charged particle in motion creates a magnetic feild
How are magnets classified according to teh origin of the magnetic property
diamagnetic weakly repelled magnetic material
ferromagnetic strongly attracted material; Iron, cobalt,nickle
paramagnetic materials that lie inbetween ferro&diamagnetic
magnetic susceptibility the degree to which a material can be magnetized
magnetic induction when a material is made magnetic from one to anotehr by inducement
what is the SI unit for magnetic field strength and also the older unit Tesla & gauss
electromotive force any device that can convert anything into electric energy
step up transformer a transformer with a >1 turn ratio; current is increased from primary to secondary
step down transformer a transformer with a <1 turn ratio; current is decreased from primary to secondary
what is the most efficient type of transformer used in radiology shell type
what are the 3 components of the x ray imaging system the tube, the console, the generator
what is the purpose of a line compensator measures the voltage provided to the x ray imaging system and adjust it to remain constant
thermionic emission the release of electron from a heated filament
what type of current do transformers operate on alternating current
voltage rectification the process of converting ac to dc
what does less voltage ripple result in constant power, greater quality and quantity
half-wave rectification
full- wave rectification
unrectified wave
single phase ripple 100%
three phase six pulse ripple 14%
three phase twelve pulse ripple 4%
high frequency generators >1%
transformer law Vs/Vp = Ns/Np
electric power formula P=IV
electromagnetic wave equation C = F*W
wave equation V = F*w
H 1 hydrogen
C 6 CARBON
N 7 NITROGEN
O 8 OXYGEN
Al 13 ALUMINUM
Ca 20 CALCIUM
Cu 29 COPPER
Y 39 YTTRIUM
Mo 42 MOLYBDENUM
Rh 45 RHODIUM
Ag 47 SILVER
I 53 IODINE
Ba 56 BARIUM
W 74 TUNGSTEN
Re 75 RHENIUM
Pb 82 LEAD
Rn 86 RADON
Ra 88 RADIUM
La 57 LANTHANIUM
GADOLINIUM
Th 90 THORIUM
Md 101 MENDELEVIUM
Created by: Pruettsgirl