Heather's Physics Flashcards
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| What is the name given to a small bundle of energy? | quantum (Bushong, p. 57)
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| What is the rate of the rise and fall of a sine wave? | frequency (Bushong, p. 58)
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| What 3 wave parameters are needed to describe electromagnetic energy? | velocity, frequecy, wavelength (Bushong, p. 59)
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| What does the wave-particle duality phenomenon suggest about photons? | Photons exibit behavior similar to both waves and particles (Bushong, p. 63)
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| What is the study of stationary electric charges? | electrostatics (Bushong, p. 73)
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| What are three ways electrification can be created? | contact, friction, or induction ((Bushong, p.73)
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| According to Coulomb's law, the electrostatic force is directly proportional to what? | the product of the electrostatic charges (Bushong, p. 76)
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| What is the unit of electrical potential? | Volt (Bushong, p. 77)
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| The ratio of the number of secondary windings to the number of primary windings in a high-voltage transformer is called the __________. | Turns ratio (Bushong, p. 109)
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| What kind of current do automatic transformers operate on? | alternating current (Bushong, p. 109)
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| The process of converting AC to DC is called ___________. | Rectification (Bushong, p. 110)
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| The cloud of electrons that forms around the filament is referred to as ______________ | the space charge (Bushong, p. 124)
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| The primary purpose of adding filtration to the x-ray beam is to: | remove low-energy x-rays (Bushong, p. 157)
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| What is the term used to describe the reduction in x-ray intensity that results from absorption and scatter? | attenuation (Bushong, p. 155)
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| The energy of the Compton-scattered x-ray is equal to the difference between the energy of what two things? | the energy of the incident x-ray and the energy of the ejected electron (Bushong, p. 164)
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| How does Compton scatter affect image contrast? | It reduces contrast (Bushong, p. 165)
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| When an x-ray interacts with inner-shell electrons and is completely absorbed, it has undergone which interaction? | photoelectric (Bushong, p. 165)
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| What is the maximum number of electrons that can occupy the N shell? | 32 (Bushong,p. 43)
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| The cones are concentrated in what part of the eye? | In the center of the retina, an area called the fovea centralis (Bushong,p. 348)
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| Which receptor in the eye is responsible for night vision, or scotopic vision? | the rods (Bushong,p. 348)
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| Name the electronic device that receives the image-forming x-ray beam and converts it into a visible-light image of high intensity. | Image intensifier (Bushong, p. 349)
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| The ratio of the number of light photons at the output phosphor to the number of x-rays at the input phosphor is called _______ _______. | Flux gain (Bushong, p. 351)
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| The ratio of the square of the diameter of the input phosphor to the square of the diameter of the output phosphor is the _________ ______. | Minification gain (Bushong, p. 351)
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| The ability of an image intensifier to incrase the illumination level of the image is called its _________ _____. | Brightness gain (Bushong,p. 351_
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| Atoms that have the same number of protons but a different number of neutrons are called ____________. | Isotopes (Bushong, p. 41)
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| The component of the x-ray tube that is negatively charged and confines the electron beam to a small area of the anode is called the: | focusing cup (Bushong, p. 123)
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| What material is the target of the anode primarily composed of? | Tungsten (Bushong,p. 126)
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| True or False: The actual x-ray source is the focal spot. | True (Bushong,p. 128)
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| When considering the anode-heel effect, a radiograph of the chest should have the cathode side of the tube positioned on the a. inferior or b. superior thorax? | a. inferior (the thicker anatomy) (Bushong, p. 131)
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