Photons
What is the smallest unit of any type of electromagnetic radiation?
Photon
What term describe the rate of the rise and fall of a sine wave?
Frequency
Which aspect of electromagnetic radiation is constant?
What is a source of direct current? What is a source of alternating current?
Generator - AC
What is the SI unit of magnetic field strength?
Tesla, T
What is used to identify or "measure" x-rays?
Energy
What type of photons have the highest frequencies?
Those with the shortest wavelengths
What is the velocity of all electromagnetic radiation?
The speed of light or 3 x 108 m/s
What is the measurement for electrical power?
Watts
Which is created by a charged particle in motion?
Magnetic Field
Where are gamma rays produced?
Nucleus of the atom
What is the electromagnetic wave equation?
c = fλ
What kind of matter do photons tend to interact with in relation to their wavelength?
Which particles are involved in the process of electrification?
Electrons only
Which is created when a group of dipoles are aligned?
Magnetic Domain
What is the diagnostic range of x-ray energy?
30 to 150 kVp
Which is directly proportional to the energy of a photon?
Frequency
What is the relationship between the intensity of radiation and the distance of the object from the source?
Which effect is produced by an electric potential applied to a conductor?
Electric current and a magnetic field
An extremity radiograph results in an exposure of 50 μGya at a distance of 90 cm. What would the exposure be if the distance is changed to 180 cm, with all other factors remaining constant?
12.5 μGya
What are the four properties of photons?
Frequency, wavelength, velocity, and amplitude
Which describes what happens to the frequency of a beam of electromagnetic radiation if its wavelength increases by a factor of 2?
Decreases by half
Which is the reduction of radiation intensity due to scattering and absorption?
Attenuation
What is Ohm's law?
V = IR
A pediatric chest x-ray is performed at 160-cm SID, yielding an exposure of 200 μGya. If the SID is adjusted to 80 cm, what would the new exposure be?
800 μGya