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The smallest quantity of any type of electromagnetic radiation; it may be pictured as a small bundle of energy, sometimes called a quantum. photon
Characteristic of materials that allow x-rays to penetrate with a minimum of attenuation. Radiolucent structures are nearly invisible on radiographs. radiolucency
A mathematical relationship describing the reduction in radiation intensity with distance from a point source. The intensity is inversely proportional to the square of the distance of the object to the source. the inverse square law
The number of wavelengths passing a point per second. frequency
Energy can be transformed into another form or into matter, but it cannot be created or destroyed. the law of conservation of energy
A form of ionizing electromagnetic radiation emitted from the nucleus of a radioactive atom. gamma ray
The wide range of electromagnetic radiation described by its frequency, wavelength or energy. electromagnetic spectrum
The mathematical or graphical description of a simple harmonic motion. sinusoidal variation
A single unit of electromagnetic radiation. quantum
A narrow region in the middle of the electromagnetic spectrum extending from approximately 400 nm (blue) to 700 nm (red) visible light
A thunder clap associated with lightning has a frequency of 800 Hz. If its wavelength is 50 cm, what is its velocity? 400 m/s
The output intensity of a normal radiographic imaging system is 5mR/mAs at 100 cm. What is the output intensity of such a system at 200 cm. 1.25 mR/mAs
What is the wave equation? velocity= frequency x wavelength
How are frequency and wavelength related? inversely
What are the three imaging windows of the electromagnetic spectrum? radiofrequency, visible light, and x-radiation.
What unit of measure is use for radiofrequency? Hertz
What unit of measure is used for visible light? meters
What unit of measure is used for x-radiation? electron volts
What is the energy range of diagnostic x-rays? 30-150 keV
What is the difference between x-rays and gamma rays? origin
Some regions in the EMS behave like waves and some behave like particles in their interaction with matter. What is this phenomenon called? wave-particle duality
The reduction of x-ray beam intensity because of absorption and scatter is called? attenuation
Unit of electric charge. coulomb
Electric charges in motion. electrodynamics
Electric current (A) through a potential (V). electric power
Stationary electric charges. electrostatics
Two poles. dipole
The ability to transfer energy from one object to another without touching. induction
An accumulation of many atomic magnets with their dipoles aligned. magnetic domain
An iron core transformer with only one winding. autotransformer
Units of magnetic intensity. Gauss and Tesla
The energy that causes electrons to move in a conductor; measured in volts (V). electric potential
What is the total circuit resistance when resistive elements of 5, 10, 15, and 20 ohms are connected in a series circuit? 50 ohms
What is the total circuit resistance when resistive elements of 5, 10, 15, and 20 ohms are connected in a parallel circuit? 2.4 ohms
A radiographic exposure requires 100 mAs. How many electrons is this? 6.3x10^17 electrons
Name three types of transformers. Closed-core, autotransformer, and shell type.
Name three ways to electrify an object. contact, friction, induction
The following are all part of what?Unlike charges attract;like charges repel,Coulomb's Law,Electrostatic force follows inverse square law,Electric charges are uniformly distributed except at high curvature regions where they concentrate. Four laws of electrostatics
Why is electrification easier in dry Phoenix than in humid Houston? humidity allows excess electrons to attach to water molecules in the air
A mobile x-ray imaging system operates on 110 V AC power. Its maximum capacity is 110 kVp and 100 mA. What is the turns ratio of the high-voltage transformer? 1000:1
What is the role of magnetism in the study of x-ray imaging? High voltage generators in x-ray imaging systems are magnetic devices. Magnetic resonance imaging deals with static and varying magnetic fields.
List three principle types of magnets. permanent magnets, electromagnets, superconducting magnets.
Current-carrying coil wrapped around a ferromagnetic core. electromagnet.
State Ohm's Law. voltage is equal to the product of current and resistance.
What happens when a bar magnet is heated to a very high temperature? it loses its magnetic properties
Give 2 examples of nonmagnetic material. wood and glass
Give 2 examples of diamagnetic material. water and plastic
Created by: 1438932103

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