Magnetic Spectrum Flashcards
What are electromagnetic waves composed of?
Electromagnetic waves are composed of transverse vibrations of electric and magnetic fields.
What is the speed of electromagnetic waves in a vacuum?
Electromagnetic waves travel in a vacuum at the speed of light
What are some properties of electromagnetic waves?
They are unaffected by electric and magnetic fields, may be polarized, can produce constructive or destructive interference, and carry energy and momentum.
How do electric and magnetic fields in electromagnetic waves orient themselves?
The electric and magnetic fields are perpendicular to each other and to the wave’s direction of travel.
What is a cycle in the context of waves?
A cycle is one complete waveform.
Define wavelength, frequency, velocity, and amplitude.
Wavelength: The distance traveled during one cycle.
Frequency: The number of cycles per second.
Velocity: The speed of light in a vacuum (c).
Amplitude: The magnitude of the peak of the waveform.
How is the electromagnetic spectrum categorized?
It is categorized into bands based on the interaction with matter and corresponding uses.
What determines the interaction between EM waves and matter?
The wavelength of the electromagnetic waves determines the size of the objects they interact with.
Give examples of interactions at different wavelengths.
Radiowaves interact with large conductors.
Infrared radiation interacts with whole atoms or molecules.
X-rays and gamma rays interact with inner electron orbits and atomic nuclei.
What role does the aluminum filter play in radiography?
It absorbs radiation, producing additional characteristic radiation.
What does the acronym “LASER” stand for?
Light Amplification by Stimulated Emission of Radiation.
What are the key features of laser light?
Laser light is highly focused, coherent, and intense, unlike ordinary light, which scatters in all directions.
What is stimulated emission?
It is the process where atoms or molecules are stimulated to emit photons in a synchronized and coherent manner.
What is phosphor plate radiography?
It is a method of recording X-rays using photostimulated luminescence (PSL) with a photostimulable phosphor plate (PSP).
How is the digital image created in phosphor plate radiography?
A laser stimulates the PSP plate, causing it to emit light. This light is collected by a photomultiplier tube, and the signal is converted into a digital image by computer technology.
What are the advantages of PSP plates in radiography?
They can be reused, and existing X-ray equipment does not need modification for their use.
