Physics Doppler Effect UPDATED ACTUAL Exam Questions and CORRECT Answers
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Course
Physics Doppler
Institution
Physics Doppler
Physics Doppler Effect UPDATED
ACTUAL Exam Questions and CORRECT
Answers
What is the doppler effect? - CORRECT 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 - CORREC...
Physics Doppler Effect UPDATED
ACTUAL Exam Questions and CORRECT
Answers
What is the doppler effect? - CORRECT 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 - CORRECT ANSWER- ✔✔higher
In a negative doppler shift the received frequency is [lower, higher] than the transmitted
frequency - CORRECT ANSWER- ✔✔lower
the amount of increase or decrease in doppler frequency depends on what 3 things? -
CORRECT ANSWER- ✔✔1. speed
2. angle
3. frequency of the wave emitted
flow information provides what 4 things? - CORRECT ANSWER- ✔✔1. presence of flow
2. direction of flow
3. speed of flow
4. character of flow
How do you acquire flow information? - CORRECT ANSWER- ✔✔doppler ultrasound
what is the doppler effect? - CORRECT ANSWER- ✔✔the change in frequency/wavelength
of a sound that results from motion
if there is no doppler effect can there still be sound? - CORRECT ANSWER- ✔✔yes
,what is required for doppler effect? - CORRECT ANSWER- ✔✔motion
what are the reflectors in human circulation? - CORRECT ANSWER- ✔✔red blood cells
What is doppler shift? - CORRECT ANSWER- ✔✔the quantitative measurement of doppler
effect
How do you determine the doppler shift? - CORRECT ANSWER- ✔✔the difference between
the received frequency and transmitted frequency
how are frequency shift and doppler shift related? - CORRECT ANSWER- ✔✔they are the
same thing
how many crystals are present in CW doppler? - CORRECT ANSWER- ✔✔2
What is the job of the two crystals in a CW transducer? - CORRECT ANSWER- ✔✔one
continuously sends, the other continuously receives
What is the advantage of CW doppler? - CORRECT ANSWER- ✔✔able to display high
velocities without aliasing
What is the disadvantage of CW doppler? - CORRECT ANSWER- ✔✔no imaging
what determines the frequency in a CW transducer? - CORRECT ANSWER- ✔✔the drive
voltage frequency
what determines the frequency in a pulsed wave transducer? - CORRECT ANSWER-
✔✔thickness of crystal
What is the Pulsed Wave operating frequency equation? - CORRECT ANSWER-
✔✔propagation speed / 2 x crystal thickness
, the process of extracting the low Doppler frequency from the transducer's carrier frequency is
called - CORRECT ANSWER- ✔✔demodulation
When blood cells move toward the transducer, the Doppler shift is [negative, positive] -
CORRECT ANSWER- ✔✔positive
When blood cells move away from the transducer, the Doppler shift is [negative, positive] -
CORRECT ANSWER- ✔✔negative
Doppler frequencies indicate _____ , not _______ - CORRECT ANSWER- ✔✔velocity, not
speed
speed is purely a - CORRECT ANSWER- ✔✔magnitude
how is speed reported? - CORRECT ANSWER- ✔✔distance over time
velocity is defined by a - CORRECT ANSWER- ✔✔magnitude and a direction
What is the biggest disadvantage of PW doppler over CW? - CORRECT ANSWER-
✔✔aliasing
How is "doppler shift" represented in equations? - CORRECT ANSWER- ✔✔Fd
How is the operating frequency represented in equations? - CORRECT ANSWER- ✔✔Fo
What is the doppler equation? - CORRECT ANSWER- ✔✔Fd = 2x Fo x v x cosθ /c
doppler shift is directly related to the _____ of the blood cells - CORRECT ANSWER-
✔✔velocity
the [slower, faster] the velocity, the greater the doppler shift - CORRECT ANSWER-
✔✔faster
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