Chapter 3 Flashcards
(27 cards)
7 parameters
period, frequency, amplitude, power, intensity, wavelength, and propagation speed
Define Period
time takes to create one single cycle
Typical units of Period
0.06-0.5 microseconds
6x10^-8 - 5x10^-7
Period is determined by and adjustable?
by sound source and not adjustable
Define frequency
of cycles (events, frames, beats) that occur in one second
Typical values of frequency
2MHz-15MHz
frequency determined by and adjustable?
determined by source and not adjustable
relationship between period and frequency
inversely related
3 Bigness parameters
intensity, amplitude, power
Define amplitude
difference between max value and average value
typical values of amplitude
any acoustic variables, 1MPa-3MPa
Amplitude determined by and adjustable
determined by sound and IT IS adjustable
define power
rate of energy transfer
Power typical values
0.004 - 0.090 watts 4-90 miliwatts
power determined by and adjustable
determined by sound and IT IS adjustable
relationship between power and amplitude
proportional
power= (amplitude)^2
Define intensity
concentration of energy in a sound beam
typical values of intensity
0.01-300 w/cm^2
intensity determined by and adjustable
determined by sound and IT IS adjustable
relationship between intensity and power
intensity=power
define wavelength
distance of length of one complete cycle
typical values of wavelength
0.1-0.8 mm
wavelength determined by and adjustable
determined by BOTH sound and medium and NOT adjustable
soft tissue has a wavelenth of
1.54 mm
