RADPRO MODULE 5 Flashcards
photons are known
electromagnetic energy
properties of EME
frequency, wavelength, velocity, and amplitude.
energy exists over a wide range called an energy
continuum
is an uninterrupted (continuous) ordered sequence.
continuum
the only EME apparent to us
visible light
smallest quantity of any type of electromagnetic energy
photon
the smallest quantity of an element
atom
It may be pictured as a small bundle of energy
photon
that travels through space at the speed of light
quantum
who showed that visible light has both electric and magnetic properties, hence the term electromagnetic energy
James Clerk Maxwell
speed of lgiht
3 𝑥 10^8 m/s.
Physicists use the term ____ to describe interactions among different energies, forces, or masses that can otherwise be described only mathematically
field
governs the interaction of different masses.
gravitational field
governs the interaction of electrostatic charges
electric field
the interaction of magnetic poles.
magnetic field,
½ of the range from 1 crest to valley over which the sine wave varies.
amplitude
highest point of sine wave
crest
lowest point of sine wave
valley
what is constant in the electromagnetic energy
velocity (c)
(λ).
lambda wavelength
usually identified as cycles per second.
frequency
SI of frequency
hertz
frequency that is audible
20 hz to 20khz
number of wavelengths that pass a point of observation per second
Frequency
the distance from one crest to another, from one valley to another, or from any point on the sine wave to the next corresponding point.
wavelength
what will happen to wavelength if the frequency increase
reduced
note
The wave amplitude is not related to wavelength or frequency.
wave equation
Velocity = Frequency x Wavelength or 𝑣=𝑓λ
frequency range of electromagnetic energy extends from approximately
102 to 1024 Hz
The photon wavelengths associated with these radiations are approximately
107 to 10-16 m
Three regions of electromagnetic radiation most important to radiologic science:
1.Visible light
2.X-ray and gamma radiation
3.Radiofrequency (RF)
wavelength, measured in
nanometers
x-rays are described in terms of a unit of energ
electron volt (eV).
This deviation in line of trave
refraction
Sunlight also contains two types of invisible light
INFRARED AND ULTRAVIOLET
consists of photons with wavelengths longer than those of visible light but shorter than those of microwaves
Infrared light
located in the electromagnetic spectrum between visible light and ionizing radiation.
Ultraviolet light
Communication broadcasts are usually identified by their frequency of transmission and are called
radiofrequency (RF) emissions
behave more like waves.
Visible light
behave more like particles
X-ray photons
interact with electrons and atoms
X-rays
– interacts with molecules
UV light
measured in nanometers (interacts with living cells)
Visible light
measured in centimeters (interacts with objects of same size)
Microwaves
measured in meters (interacts with metal rods called antennas
Radio & TV waves
Structures that absorb x-rays are
radiopaque
structure that transmit light
radiolucent
This decrease in intensity is inversely proportional to the square of the distance of the object from the source
inverse square law
X-ray energy ranges from approximatel
10 keV to 50 MeV.
Planck’s constant and (h)
4.15 × 10-15 eVs or
6.63 × 10-34 Js.
