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Physics I

Chapter 4 - Electromagnetic Radiation

What are the 4 properties of photons? frequency, wavelength, velocity, amplitude
____ is a quantum of electromagnetic energy x-ray photon
Which part of the sine wave does amplitude represent? The top half
- 1/2 the range from crest to valley over which the sine wave varies amplitude
What is the sign of frequency? nu
- how often the crests of a wave occur frequency
What is the unit of measurement of frequency? Hz
What is the sign of wavelength? lamda
What is the unit of measurement for wavelength? angstrom
- the distance btwn the crests of a wave? wavelength
- refers to the strongest photon in the beam of radiation min wavelength
frequency and wavelength are ____ proportional inversely
What are the 3 regions of electromagnetic spectrum? visible light, radio frequency, x-radiation
List in order from longest/lowest to shortest/highest: x-ray, radio, visible light, gamma, cosmic, infra-red, microwaves radio, microwaves, visible light, x-ray, gamma, cosmic
- where pure energy act as though it has the characteristics of matter wave-particle duality
What is an ex of the wave-particle duality? where a x-ray photon dislodges an electron from an atom
-when light is deviated from its line of travel refraction
- a substance that absorbs radiation / seen as white or clear on the image radiopaque
- a substance that attenuates radiation / seen as a dark area on the image radiolucent
x-rays are _____ proportional to frequency directly
what is the law of conservation of energy? energy can never be created or destroyed / e=mc2
x-ray wavelength is _______ proportional to frequency. inversley
Which is true for both 100 keV xray and 10 keV gamma ray? they have zero mass
A single unit of electromagnetic radiation is also called a _____ photon
Which of the following has a constant value for all electromagnetic radiation? velocity
The amplitude of a sine wave is its: zero to max
The principal difference btwn x-rays and gamma rays is their: origin
For any electromagnetic radiation: an increase in frequency results in an increase in energy
If an x-ray imaging system is operated at 40 kVp, then: 20 keV xrays are emitted
Which of the following characteristics is the same for both ultraviolent radiation and microwaves? velocity
xrays can be: attenuated
When a radiograph is viewed, one might properly state that: lung tissue is radiolucent
According to quantum mechanics, the energy of x-ray is: inversely proportional to its wavelength
In radiographs of bony structures embedded in soft tissue, the bone is: radiopaque
Which of the following types of electromagnetic radiation interacts with matter such as a particle? gamma rays
If the exposure rate 1 m from a source is 9 mR/hr, what is the exposure rate 3 m from the source? 1 mR/hr
The inverse square law states what? Intensity is inversely proportional to the square of the distance
The inverse square law is a result of: divergence
The inverse square relationship applies to which of the following sources? point
To apply the inverse square law, one must know: two distances and one intensity
Which of the following terms is associated with diagnostic imaging? superficial x-rays
The energy of an xray photon is directly proportional to its: frequency
The energy of and x-ray : is inversely proportional to its wavelength
An xray also can be correctly called a: photon
Created by: erikasmith28