Waves
something all waves carry
what is energy
the 7 acoustic parameters
what are period, frequency, amplitude, power, intensity, wavelength, and propagation speed
1/second, hertz, Hz
wavelength
what is the distance or length of one complete cycle
time from start of one pulse to start of next pulse
what is PRP
effects of the sound wave upon the biologic tissue through which it passes
the time it takes a wave to vibrate a single cycle
period
three bigness parameters
what are amplitude, power, and intensity
formula for propagation speed
what is frequency x wavelength
description of relationship of beam intensities to time
what is duty factor
effects of the medium upon the sound wave
what is acoustic propagation properties
the number of particular events that occur in a specific duration of time
frequency
what is the rate of energy transfer
bigness of the wave
what is amplitude
what is the distance from the start to the end of a pulse
the acoustic variables of a sound wave
what are pressure, density, and distance
less than 20 Hz
what is infrasound
formula for intensity
what is W/cm^2 (power/area)
pulsed sound
what is a collection of cycles that travels together
PRF
number of pulses transmitted into the body per second
interference of two waves that result in a wave of greater amplitude
what is constructive interference
greater than 20 MHz
what is ultrasound
3,500 m/s (prop speed)
what is the speed of sound in bone
formula for PD
# cycles / frequency
intensities from largest to smallest
SPTP --> Imax --> SPPA --> SPTA --> SATA