Physics Doppler UPDATED ACTUAL Exam Questions and CORRECT Answers
0 view 0 purchase
Course
Physics Doppler
Institution
Physics Doppler
Physics Doppler UPDATED ACTUAL
Exam Questions and CORRECT Answers
Doppler Shift AKA - CORRECT ANSWER- Doppler Frequency
The Doppler Effect - CORRECT 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
Relativ...
Physics Doppler UPDATED ACTUAL
Exam Questions and CORRECT Answers
Doppler Shift AKA - CORRECT ANSWER- ✔✔Doppler Frequency
The Doppler Effect - CORRECT 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 - CORRECT ANSWER-
✔✔a frequency change
The frequency of sound changes when the sound source & the receiver - CORRECT
ANSWER- ✔✔move closer together or father apart
Amount of increase or decrease (in frequency) depends on: - CORRECT 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 -
CORRECT ANSWER- ✔✔remains constant
The Doppler Principle - CORRECT ANSWER- ✔✔is used to measure red blood cell
velocities
As the velocity increases, the Doppler shift - CORRECT ANSWER- ✔✔increases
If the detected frequency is *lower* than the transmitted frequency, the Doppler shift is -
CORRECT ANSWER- ✔✔negative
,If the detected frequency is *higher* than the transmitted frequency, the Doppler shift is -
CORRECT ANSWER- ✔✔positive
The Doppler shift is - CORRECT ANSWER- ✔✔a low frequency that "rides" on top of the
much higher transducer frequency
Demodulation - CORRECT ANSWER- ✔✔a process that extracts the low Doppler frequency
from the transducer's carrier frequency
Transducer frequencies of __________________ are used to perform Doppler exams -
CORRECT ANSWER- ✔✔2 MHz - 10 MHz
Doppler shifts range from _______________________ & fall into the audible range of sound
- CORRECT ANSWER- ✔✔20 Hz - 20,000 Hz (20 KHz)
Doppler Shift = - CORRECT ANSWER- ✔✔Reflected Frequency - Transmitted Frequency
Doppler shifts are created when - CORRECT ANSWER- ✔✔transmitted waves strike
moving RBCs
(+) Doppler shift occurs when blood moves _____________ the transducer - *the reflected
frequency is higher than the transmitted frequency* - CORRECT ANSWER- ✔✔towards
(-) Doppler shift occurs when blood moves __________ from the transducer - *the reflected
frequency is lower than the transmitted frequency* - CORRECT ANSWER- ✔✔away
X-axis of the Doppler spectrum represents - CORRECT ANSWER- ✔✔time
Y-axis represents the - CORRECT ANSWER- ✔✔Doppler shift or velocity
Doppler frequencies indicate _____________, not speed - CORRECT ANSWER-
✔✔velocity
, Speed - CORRECT ANSWER- ✔✔a *magnitude* & indicates the distance a RBC moves in
1 sec
Speed is reported in units of - CORRECT ANSWER- ✔✔cm/sec - any unit of distance/time
Velocity - CORRECT ANSWER- ✔✔a *magnitude* & a direction
An automobile is traveling from New York to Florida at a rate of 50 miles per hour -
CORRECT 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 - CORRECT ANSWER- ✔✔Doppler Shift = 2 x velocity of blood x
transducer frequency x cos0 / propagation speed
Doppler shift is caused by - CORRECT ANSWER- ✔✔a change of wavelength caused by
motion relative to the observer
Wavelength = - CORRECT ANSWER- ✔✔Propagation Speed / Frequency
When frequency increases, wavelength - CORRECT ANSWER- ✔✔decreases
When wavelength decreases, Doppler shift - CORRECT ANSWER- ✔✔increases
When Doppler shift increases, Transmit Frequency - CORRECT ANSWER- ✔✔increases
Propagation velocity & wavelength are ____________ related - CORRECT ANSWER-
✔✔directly
Doppler shift is ___________ related to the frequency of transmitted sound - CORRECT
ANSWER- ✔✔directly
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller MGRADES. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $9.99. You're not tied to anything after your purchase.
