Edelmen book (sound) Flashcards
(37 cards)
Sound is a ___ and ____ wave. travels in a ____ line and
mechanical, longitudinal . straight
The effects of the sound wave upon the biological tissue through which is passes
Biologic effects
The effects of the medium upon the sound wave
Acoustic propagation properties
3 acoustic variables
Pressure, density, and distance
Concentration of force in an area and the unit
Pressure / unit: pascals
Concentration of mass in a volume
Density / unit kg/cm3
Measure of particle motion
Distance / unit cm, mm
7 acoustic parameters
Period, frequency, amplitude, power, intensity, wavelength, prop speed
Particles move in a direction that is perpendicular
Transverse wave
Particles move in same direction that the wave propogates
Longitudinal wave
Time it takes a wave to vibrate a single cycle or the time from the start of one cycles to the start of the next
Period us
Number of cycles that occur in one second
Frequency Hz
Frequency ranges from approx
2 MHZ - 15 MHZ
Infrasound
< 20 hz
Audible sound
20 hz - 20 khz
Ultrasound
> 20 khz
the 3 parameters
Amplitude, power, intensity
Difference between the max value and min value of an acoustic variable. The bigness of the wave
Amplitude
Rate of energy transfer or the rate at which work is performed
Power (watts)
Concentration of energy in the sound beam
Intensity (W/ cm2)
The distance or length of one complete cycle
Wavelength mm
Wavelength ranges from
0.1 - 0.8 mm
Rate at which sound wave travels through a medium
Propagation speed
Slowest to fastest prop speed from lung to bone
lung, fat, soft tissue, liver, blood, muscle, tendon, bone.
