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Physics Doppler Questions & Verified Answers |
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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
, 2
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
, 3
X-axis of the Doppler spectrum represents - (answer)time
Y-axis represents the - (answer)Doppler shift or velocity
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
Physics Doppler Questions & Verified Answers |
100% Pass Rate Guaranteed | Latest Updated
Version
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
, 2
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
, 3
X-axis of the Doppler spectrum represents - (answer)time
Y-axis represents the - (answer)Doppler shift or velocity
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
