Exam 2 ch. 5-7 Flashcards
(Ch 5) Velocity
symbol: v
how fast energy oof wave moves from one point to another
radiology measured in seconds (meters/second)
(Ch 5) Amplitude
the strength of the wave (not the energy)
maximum displacement of media from its equilibrium
(Ch 5) wavelength
Symbol: (lambda) λ
distance between two like points (crest to crest) constitutes one cycle
measure in angstroms
xray range .1-.5
(Ch 5) frequency
Symbol: f –
Measured in Hertz (Hz)
The number of cycles that pass a
fixed point in a second.
(Ch 5) Velocity triangle
V = Fλ
λ= v/f
f=v/λ
(Ch 5) what is frequency and wavelengths relationship?
NVERSELY PROPRTIONAL relationship
When frequency increases, wavelength must decrease if velocity is constant.
(Ch 5) electromagnetic wave formula
All electromagnetic waves travel at the speed of LIGHT (in a vacuum)
If frequency goes up, wavelength goes down (is shorter)
Energy is directly proportional to FREQUENCY
(Ch 5) Resonance
The tendency of electromagnetic radiation to interact with substances that have a natural frequency similar to theirs
(Ch 5) visible light
reflect
refract
disperse
absorb
(Ch 5) high energies behave like:
PARTICLES
(Ch 5) x-rays
about the highest energy you can get
do not reflect
do not refract
do not disperse
but do absorb
(Ch 5) X-rays with absorbtion
X-rays with low energy
X-rays that interact with radiopaque objects
(Ch 5) x-rays that transmission
X-rays with high energy
X-rays that do not interact with radiopaque objects.
(Ch 5) what kind of nature do x-rays have?
dual nature
They have qualities of both light photons and physical particles.
(Ch 5) What is attenuation?
The partial absorption of light or x-rays
(Ch 5) what is radiolucent?
x-rays can pass easily
ex: air
(Ch 6) MAGNETIC MOMENT
The orientation of the magnetic field for a single electron or proton
(Ch 5) What is radiopaque?
allowing very few x-rays to pass
ex: jewelry, bones, leads
(Ch 6) electromagnetism
all moving electric charges develop magnetic fields
(Ch 6) MAGNETIC DIPOLE
The small magnetic field around an entire atom
(Ch 6) MAGNETIC DOMAIN
A group of atoms that all have their magnetic dipoles pointed in the same direction
(Ch 6) FERROMAGNETIC (materials)
Materials such as iron and nickel that allow their magnetic domains to be easily lined up in the same direction when subjected to a strong external magnetic field.