Midterms | Unit 3: Electromagnetic Wave Flashcards
(1) consist of both electric and magnetic field waves. These waves oscillate in (2) with respect to each other and are in (3).
- Electromagnetic waves
- perpendicular planes
- phase
The creation of all electromagnetic waves begins with an oscillating (1), which creates oscillating (2).
- charged particle
- electric and magnetic fields
Once in (1), the electric and magnetic fields that a charged particle creates are(2): time-dependent changes in one field (electric or magnetic) produce the other.
- motion
- self-perpetuating
The type of energy in x-rays, radio waves, microwaves & visible light
Electromagnetic Energy
The smallest quantity of any kind of electromagnetic energy
Photon
Photon may be pictured as a —
quantum
Waveform of a photon
o Waveform: sinusoidal fashion
A small bundle of energy
Quantum
Properties of Electromagnetic Energy
o Frequency
o Wavelength
o Velocity
o Amplitude
He showed that visible light has both electric & magnetic properties
James Clerk Maxwell (Late 19th Century)
Three Wave Parameters
Velocity, Frequency & Wavelength
These are used for both sound & electromagnetic energy
Electromagnetic Wave Equation
He synthesized our understanding of electromagnetic radiation
Max Planck
When did Planck receive the Nobel Prize?
1918
Planck’s Quantum Theory
X-rays are created with the (1)
X-rays exist with (1), or they do not exist at all
- speed of light (c)
- velocity
Planck’s Quantum Equation
E = hf
PLANCK’S CONSTANT
h=4.15 x 10-15 Ev-s
Wave-Particle Duality
✓ Visible Light Photons
✓ X-ray Photons
✓ Wave Particle duality
They behave more like waves
Visible Light Photons
They act more like particles
X-ray Photons
The principle that states that both wave & particle concepts must be retained, because wave-like properties are exhibited in some experiments & particle-like properties are manifested in others
Wave Particle duality
Photons interact with matter most easily when the (1) is approximately the same size as the (2)
- matter
- photon wavelength
The reduction in intensity that results from scattering & absorption
Electromagnetic Energy Attenuation
Interaction Between Light & Absorbing Material
✓ Transparency: not at all (transmission)
o e.g., window glass
✓ Translucency: partially (attenuation)
o e.g., frosted glass
✓ Opacity: completely (absorption)
o e.g., black glass
The structures that absorb x-rays
Radiopaque
Example of radiopaque
Bones
The structures that transmit x-rays
Radiolucent
Example Radiolucent
Lung tissue
