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Physics Doppler Exam Study Guide Solutions

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Physics Doppler Exam Study Guide Solutions Doppler Shift AKA - ANSWER-Doppler Frequency The Doppler Effect - ANSWER-An apparent change in frequency as a result of a change in wavelength caused by motion of a wave source relative to an observer Relative motion between the sound source & the rec...

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  • November 4, 2024
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Physics Doppler Exam Study Guide

Solutions


Doppler Shift AKA - ANSWER✔✔-Doppler Frequency


The Doppler Effect - ANSWER✔✔-An apparent change in frequency as a result of a change in wavelength

caused by motion of a wave source relative to an observer


Relative motion between the sound source & the receiver creates - ANSWER✔✔-a frequency change


The frequency of sound changes when the sound source & the receiver - ANSWER✔✔-move closer

together or father apart


Amount of increase or decrease (in frequency) depends on: - ANSWER✔✔-- Speed of motion


- Angle between the wave propagation direction


- Motion direction


- Frequency of wave emitted by the source


The frequency does not change when the distance between the sound source & the receiver -

ANSWER✔✔-remains constant


The Doppler Principle - ANSWER✔✔-is used to measure red blood cell velocities


As the velocity increases, the Doppler shift - ANSWER✔✔-increases




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If the detected frequency is *lower* than the transmitted frequency, the Doppler shift is - ANSWER✔✔-

negative


If the detected frequency is *higher* than the transmitted frequency, the Doppler shift is - ANSWER✔✔-

positive


The Doppler shift is - ANSWER✔✔-a low frequency that "rides" on top of the much higher transducer

frequency


Demodulation - ANSWER✔✔-a process that extracts the low Doppler frequency from the transducer's

carrier frequency


Transducer frequencies of __________________ are used to perform Doppler exams - ANSWER✔✔-2

MHz - 10 MHz


Doppler shifts range from _______________________ & fall into the audible range of sound -

ANSWER✔✔-20 Hz - 20,000 Hz (20 KHz)


Doppler Shift = - ANSWER✔✔-Reflected Frequency - Transmitted Frequency


Doppler shifts are created when - ANSWER✔✔-transmitted waves strike moving RBCs


(+) Doppler shift occurs when blood moves _____________ the transducer - *the reflected frequency is

higher than the transmitted frequency* - ANSWER✔✔-towards


(-) Doppler shift occurs when blood moves __________ from the transducer - *the reflected frequency is

lower than the transmitted frequency* - ANSWER✔✔-away


X-axis of the Doppler spectrum represents - ANSWER✔✔-time


Y-axis represents the - ANSWER✔✔-Doppler shift or velocity

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Doppler frequencies indicate _____________, not speed - ANSWER✔✔-velocity


Speed - ANSWER✔✔-a *magnitude* & indicates the distance a RBC moves in 1 sec


Speed is reported in units of - ANSWER✔✔-cm/sec - any unit of distance/time


Velocity - ANSWER✔✔-a *magnitude* & a direction


An automobile is traveling from New York to Florida at a rate of 50 miles per hour - ANSWER✔✔-- Speed

= 50 miles/hour (speed is a magnitude)


- Velocity is 50 miles/hour to the south (velocity is a magnitude & a direction)


Doppler Equation - ANSWER✔✔-Doppler Shift = 2 x velocity of blood x transducer frequency x cos0 /

propagation speed


Doppler shift is caused by - ANSWER✔✔-a change of wavelength caused by motion relative to the

observer


Wavelength = - ANSWER✔✔-Propagation Speed / Frequency


When frequency increases, wavelength - ANSWER✔✔-decreases


When wavelength decreases, Doppler shift - ANSWER✔✔-increases


When Doppler shift increases, Transmit Frequency - ANSWER✔✔-increases


Propagation velocity & wavelength are ____________ related - ANSWER✔✔-directly


Doppler shift is ___________ related to the frequency of transmitted sound - ANSWER✔✔-directly


**Velocity of blood is _______________ of propagation speed** - ANSWER✔✔-independent



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