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Physics Doppler Effect Exam Practice Questions and Answers

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Physics Doppler Effect Exam Practice Questions and Answers What is the doppler effect? - ANSWER-a change in frequency caused by the motion of a sound source In a positive doppler shift the received frequency is [lower, higher] than the transmitted frequency - ANSWER-higher In a negative doppl...

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  • November 4, 2024
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Physics Doppler Effect Exam Practice

Questions and Answers


What is the doppler effect? - ANSWER✔✔-a change in frequency caused by the motion of a sound

source


In a positive doppler shift the received frequency is [lower, higher] than the transmitted frequency -

ANSWER✔✔-higher


In a negative doppler shift the received frequency is [lower, higher] than the transmitted frequency -

ANSWER✔✔-lower


the amount of increase or decrease in doppler frequency depends on what 3 things? - ANSWER✔✔-1.

speed


2. angle


3. frequency of the wave emitted


flow information provides what 4 things? - ANSWER✔✔-1. presence of flow


2. direction of flow


3. speed of flow


4. character of flow


How do you acquire flow information? - ANSWER✔✔-doppler ultrasound



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what is the doppler effect? - ANSWER✔✔-the change in frequency/wavelength of a sound that results

from motion


if there is no doppler effect can there still be sound? - ANSWER✔✔-yes


what is required for doppler effect? - ANSWER✔✔-motion


what are the reflectors in human circulation? - ANSWER✔✔-red blood cells


What is doppler shift? - ANSWER✔✔-the quantitative measurement of doppler effect


How do you determine the doppler shift? - ANSWER✔✔-the difference between the received frequency

and transmitted frequency


how are frequency shift and doppler shift related? - ANSWER✔✔-they are the same thing


how many crystals are present in CW doppler? - ANSWER✔✔-2


What is the job of the two crystals in a CW transducer? - ANSWER✔✔-one continuously sends, the other

continuously receives


What is the advantage of CW doppler? - ANSWER✔✔-able to display high velocities without aliasing


What is the disadvantage of CW doppler? - ANSWER✔✔-no imaging


what determines the frequency in a CW transducer? - ANSWER✔✔-the drive voltage frequency


what determines the frequency in a pulsed wave transducer? - ANSWER✔✔-thickness of crystal


What is the Pulsed Wave operating frequency equation? - ANSWER✔✔-propagation speed / 2 x crystal

thickness




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the process of extracting the low Doppler frequency from the transducer's carrier frequency is called -

ANSWER✔✔-demodulation


When blood cells move toward the transducer, the Doppler shift is [negative, positive] - ANSWER✔✔-

positive


When blood cells move away from the transducer, the Doppler shift is [negative, positive] - ANSWER✔✔-

negative


Doppler frequencies indicate _____ , not _______ - ANSWER✔✔-velocity, not speed


speed is purely a - ANSWER✔✔-magnitude


how is speed reported? - ANSWER✔✔-distance over time


velocity is defined by a - ANSWER✔✔-magnitude and a direction


What is the biggest disadvantage of PW doppler over CW? - ANSWER✔✔-aliasing


How is "doppler shift" represented in equations? - ANSWER✔✔-Fd


How is the operating frequency represented in equations? - ANSWER✔✔-Fo


What is the doppler equation? - ANSWER✔✔-Fd = 2x Fo x v x cosθ /c


doppler shift is directly related to the _____ of the blood cells - ANSWER✔✔-velocity


the [slower, faster] the velocity, the greater the doppler shift - ANSWER✔✔-faster


the faster the velocity the [lesser, greater] the doppler shift - ANSWER✔✔-greater


When the velocity is halved the doppler shift is - ANSWER✔✔-halved



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