Sound Flashcards
Sound waves are identified by _______ in acoustic variables.
Oscillations
Three acoustic variables that are used to distinguish between sound waves and other types of waves.
Pressure, density, distance
All waves ________ from one location to another.
Carry energy
Sound is a _______ wave in which particles in a medium move.
Mechanical
Sound must travel through a medium where molecules are alternately __________ (squeezed together) and _________ (stretched apart).
Compressed, rarefied
Sound travels in a _______ line.
Straight
Sound waves are ________ waves.
Longitudinal
The effects of the medium upon the sound wave.
Acoustic propagation properties
The effects of the sound wave upon the biological tissue through which it passes.
Biologic effects
Concentration of force in an area.
Pressure
Units of pressure
Pascals (Pa)
Concentration of mass in a volume
Density
Units of density
Kg / cm^3
Measure of particle motion
Distance
Units of distance
Cm, feet, mile
Sound waves are also known as
Acoustic waves
Seven acoustic parameters that are used to describe the characteristics of a sound wave.
Period, frequency, amplitude, power, intensity, wavelength, propagation speed
In a _______ wave, particles move in a direction that is perpendicular to the direction that the wave propagates.
Transverse
In a _______ wave, particles move in the same direction that the wave propagates.
Longitudinal
A pair of waves who’s peaks occur at the same time and at the same location.
In-phase
When two wave’s peaks occur at different times, and so do their troughs.
Out-of-phase
When more than one sound beam travels in a medium, their beams arrive at an identical location at the same time, and their waves lose their individual characteristics at that moment to form a single wave.
Interference
Interference of a pair of in-phase waves that results in the formation of a single wave of greater amplitude than either of its components.
Constructive interference
Interference of a pair of out-of-phase waves resulting in the formation of a single wave of lesser amplitude than at least one of its components.
Destructive interference
When two out-of-phase waves are of equal amplitude, this may occur…
Complete destructive interference
Interesting phenomenon when waves of different frequencies interfere.
Both constructive and destructive interference
What do waves transfer from one location to another?
Energy
Which of the following best describes sound waves?
A. A series of compressions and rarefactions
B. Waves that are heard by man
C. Movement of molecules and energy from one location to another
D. Waves that are used to make images of anatomy
A. Sound waves are a series of compressions and rarefactions
Which of the following terms does not belong with the others?
A. Compression
B. Region of high density
C. Region of high pressure
D. Wide molecular spacing
D. Wide molecular spacing
Variations in all of the following identify specific waves as acoustic waves except…
A. Pressure
B. Parameters
C. Density
D. Acoustic variables
B. Parameters
All of the following are true of sound waves except…
A. They are acoustic
B. They are pressure waves
C. They are transverse
D. They move energy
C. They are transverse
All of the following are acoustic parameters except…
A. Pressure
B. Period
C. Propagation speed
D. Frequency
A. Pressure
Which of the following best describes sound waves?
A. Transverse, pressure waves
B. Transverse, longitudinal waves
C. Longitudinal, out-of-phase waves
D. Longitudinal, pressure waves
D. Longitudinal, pressure waves
Two waves are traveling in a medium and arrive at a location at the same time. What event takes place?
Interference
Which types of waves will exhibit both constructive and destructive interference?
Waves of different frequency
What units are used to report the pressure of a sound beam?
Pascals
True or false? Acoustic variables allow us to determine which waves are sound waves and which are not.
True
True or false? Acoustic parameters are used to describe the features of sound waves.
True
