In diagnostic sonography, the so-called Doppler effect is used for the determination of blood flow velocity. This is done by measuring the frequency of the sound reflected by detected blood cells. The sound is reflected by the blood cells. What exactly is sound, which vibration modes exist and how do they react on interfaces—all of this will be addressed in the following article.
The lecture Sound Dynamics by Jared Rovny is from the course Sound.
Included Quiz Questions
Which of the following best describes the addition of sound waves?
Each point of the total wave is the sum of the corresponding points on the individual waves
The total wave is the subtraction between corresponding points on the individual waves, final to initial
The individual waves are each collected to an individual value, which is then added to make the total wave
Each point of the total wave is found by taking the highest point of the individual waves
The total wave is found by adding the source and receiver of the individual waves
How are beats formed by individual waves?
Periodic constructive and destructive interference
A third wave produced by the difference of the two individual waves
Pressure changes in the environment around the individual waves
Compression and rarefaction of the sound source
Longitudinal variations in transverse waves
A musician is trying to tune their instrument by comparing one note to another known note. The known source is producing a frequency of 440 Hz, while the string on the instrument is producing a frequency of 420 Hz. What beat frequency does the musician hear?
Author of lecture Sound Dynamics
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