Exam (elaborations)

Physics Doppler Effect UPDATED ACTUAL Exam Questions and CORRECT Answers

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Physics Doppler

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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...

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Uploaded on October 21, 2024
Number of pages 19
Written in 2024/2025
Type Exam (elaborations)
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Institution Physics Doppler
Course Physics Doppler

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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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Exam (elaborations)

Physics Doppler Effect UPDATED ACTUAL Exam Questions and CORRECT Answers

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