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17 Cards in this Set
- Front
- Back
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What is Electromagnetic attenuation?
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Reduction in intensity that results from scattering and absorbtion.
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What are the three interactions between light and an absorbing material?
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transparency, translucency, and opacity.
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Structures that absorb x-rays are called...
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Radiopaque
(bone) |
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Structures that transmit x-rays are called...
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Radiolucent
(lung tissue) |
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What is the inverse square law?
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Itensity one over intensity two equals distance 2 over distance one, squared.
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How does electromagnetic energy intensity related to the square distance from the source?
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It is inversly proportional.
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What is the theory of relativity?
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E= mc squared
E is the energy measured in joules, m is the mass in kilograms and c is the velocity of light in meters per second. |
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photon
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smallest property of any type of electromagnetic radiation.
Quantom- bundle of energy |
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How does frequency relate to energy?
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directly proportional. When energy rises, so does frequency.
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What is the velocity of a photon?
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speed of light
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What is amplitude?
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one half the range from the crest to the valley. (rise and fall from the line of progation)
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What is wavelength?
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distance from one crest to another. from any point on the sine wave to the next corresponding point.
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The wave equation...
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wavelength= velocity/frequency
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electromagnetic wave equation...
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C= frequency X velocity
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refraction
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deviation in line travel with light
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What is visible light identified by?
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frequency
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What are xrays identified by?
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Energy
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