Chapter 2: sound Flashcards
Sound only travels through ____
Media
soft tissue
body
All waves
carry energy from one location to another
sound is what kind of wave?
Mechanical; in which the particles in the medium move.
compressed
squeezed together
rarefied
stretched apart
sound cannot travel through
a vacuum
sound travels in a _______ line
straight
sound waves are ________ waves
longitudinal
acoustic propagation properties
The effects of the medium upon the sound wave
biologic effects
the effects of the sound wave upon the biologic tissue through which it passes
pressure
concentration of force in an area.
pascals (Pa)
pressure
Density
concentration of mass in a volume.
kg/cm^3
density
distance
measure of particle motion.
cm, feet, mile
units of distance
oscillation
to move back and forth at a regular speed
Three acoustic variables used to distinguish between sound waves and other types of waves.
pressure, density, and distance
7 acoustic parameters used to describe sound waves
-period
-frequency
-amplitude
-power
-intensity
-wavelength
-propagation speed
All waves ____ from one location to another
energy
Sound waves are ____ in which particles in the medium move back and forth from a fixed position
mechanical
Transverse Wave
particles move in a perpendicular direction to the direction the wave propagates
If one of these acoustic variables has ______ then the wave is a sound wave
rhythmic oscillations
Sound waves
acoustic waves
In-phase waves
peas and valleys occur at the same time in both waves. “in step”
Out-of-phase waves
occur when peaks and valleys occur at different times.` “out of step”
Both in phase and out-of-phase can undergo
interference
Interference
occurs when the waves lose their individual characteristics at that moment and combine to make a single wave.
constructive interefence
resulting wave is larger than either component
destructive interference
resulting wave is smaller than either component
what do waves transfer from one location to another?
a. matter
b. molecules
c. energy
d. water
C. energy
which of the following best describes sound waves?
A. a series of compressions and rarefactions
B. waves that are heard by man
C. movements of molecules and energy from one location to another
D. waves that used to make images of anatomy
A. a series of compressions and rarefactions
Which of the following 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 waves
D. they move energy
C. sound waves are longitudinal
All of the following are acoustic parameters EXCEPT;
A. pressure
B. period
C. propagation speed
D. frequency
A. pressure
it is an acoustic variable not a parameter
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. What even takes places?
A. constructive interference
B. destructive interference
C. interference
D. reflection
C. interference
Which types of waves will exhibit both constructive and destructive interference?
A. waves of different amplitude
B. a pair of longitudinal waves
C. waves of different frequency
D. out-of-phase waves
c. both constructive and destructive interference occurs with waves at different frequencies.
What units are used to report the pressure of a sound beam?
A. pounds
B. centimeters
C. pascals
D. kg/cm
C. Pascals. Pressure is appropriately reported with units of Pa.
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 features of sound waves.
True.
