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Essentials of Radiographic Physics and Imaging 3rd Edition By James Johnston; Terri L. Fauber
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Essentials of Radiographic Physics and Imaging 3rd Edition By James Johnston; Terri L. Fauber
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RTE 1401 Essentials of Radiographic Physics & Imaging ch 1
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Test Bank For Essentials of Radiographic Physics and Imaging3rd Edition By James Johnston; Terri L. Fauber
What does an alpha particle consist of? - ANSWER: 2 protons and 2 neutrons
What are x ray and gamma ray similarities? - ANSWER: They are the highest energy
members and have the ability to ionize matter.
What are two types of ionizing radiation? - ANSWER: particulate and
electromagnetic
How do x rays and gamma rays differ? - ANSWER: Each originate from a different
energy source.
gamma rays originate from - ANSWER: nuclei of atoms and represent the excess
energy the atom is giving off to reach a stable state.
x-rays originate through - ANSWER: interactions between electrons and atoms
X-rays are produced when - ANSWER: fast moving electrons within the x-ray tube
strike the atoms of the metal in its target
What are two types of electromagnetic radiation? - ANSWER: Ionizing and non-
ionizing
Define electromagnetic radiation - ANSWER: An electric and magnetic disturbance
traveling at the speed of light.
Tanning beds use what type of electromagnetic radiation? - ANSWER: Ultraviolet
Why do some objects appear black? - ANSWER: represents absorption of all color
wavelengths.
If an x-ray beam has an intensity of 1.2 mGy at 40 inches, what is the intensity of the
beam at 60 inches? - ANSWER: 0.53
What is the unit of measurement for frequency? - ANSWER: Hertz (Hz)
What is common use for radio waves? - ANSWER: MRI- Magnetic Resonance Imaging
Define radioactive decay - ANSWER: A radioactive element giving off excess energy
and particles to regain stability.
, Name one thing that all of the members of the electromagnetic spectrum have in
common. - ANSWER: They have the same velocity
Speed of light
how to the members of the electromagnetic family differ? - ANSWER: have the same
velocity however they vary in energy, wavelength, and frequency.
What does intensity do as distance from the source increases? - ANSWER: Decreases
How are microwaves used to heat up food? - ANSWER: They hit the atoms of the
food giving them excess energy causing a vibration of atoms and molecules.
If the frequency of electromagnetic radiation decreases what will the wavelength
do? - ANSWER: Increase
Which of the following do not originate from an unstable nucleus? Gamma rays, x
rays, alpha particles, or beta particles? - ANSWER: x-rays
Define wavelength - ANSWER: Measure of distance from the peak of one wave to the
peak of the next wave.
Who developed the electromagnetic theory? - ANSWER: James Maxwell
What are the characteristics of electromagnetic radiation? - ANSWER: *carries
energy in waves
*causes magnetic/electrical disturbances
*Travels at the speed of light
*can ionize matter and cause biological damage
*2 types ionizing /non-ionizing
*needs no medium (no mass)
*can travel through a vacuum
What are the 2 types of disturbances caused by electromagnetic radiation? -
ANSWER: *electric
*magnetic
1 kilohertz (kHz) is equal to:_____hertz - ANSWER: 1,000
Define amplitude - ANSWER: Maximum height of the wave
Which has the shortest wavelength/most energy?
X-rays or visible light - ANSWER: X- rays
Is E=hf direct proportionality or inverse - ANSWER: Direct -if energy increases so
does frequency
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