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23 Cards in this Set
- Front
- Back
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What is the simplest waveform?
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sine wave
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360 degrees is complete cycle
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sine wave
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What is the distance b/w any 2 corresponding points in successive cycles?
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wavelength
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What is the maximum displacement of the wave from horizontal?
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amplitude
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What is the time b/w wave cycles?
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Wave period
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What is the speed of propagation of wave called?
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wave velocity (medium specific - ie: vacuum vs air)
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What is defined in cycles per second, Hz?
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Wave frequency
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What is proportional to wave frequency?
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wave energy
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Explain the concept of phase of waves
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the relationship of one wave to another
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What is the interaction of 2 or more sine waves called?
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interference
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What does the final waveform depend on (in reference to interference)?
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phase relationship
frequency amplitude |
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what is summation?
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0 degree phase difference
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what is cancellation?
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180 degree phase difference
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What color has longer wavelength and lower frequency?
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red
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What color has shorter wavelength and higher frequency?
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purple
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What is a change in frequency and wavelength of a wave as perceived by an observer moving relative to the source of the wave?
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Doppler effect
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What is a very high frequency sound that travels well through tissues?
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Ultrasound
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What detects the movement of RBC's by doppler shift, producing audible sounds related to flow velocity?
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ultrasound;
flowing toward increasing freq --> red flowing away decreasing freq --> blue |
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How is CO measured vis ultrasound?
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can determine the amount of blood in the arch of aorta. CO estimated from measure of aortic diameter
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How does fetal heart rate monitor work?
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ultrasound; reflects off fetal heart and detects rate change quickly and accurately
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What are 2 limits to ultrasound?
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heating of tissues
cavitation |
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Any complex wave pattern can be produced by adding together a large number of appropriate sine waves...this is called
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Fourier analysis
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Wave patterns in a fourier analysis that have sharp spikes have ____ frequency sine wave components
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high
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