Mega
Million
Kilo
1000
Centi
one-hundredth
Milli
one-thousandth
Micro
one-millionth
Audible sound range
20-20,000 Hz
Diagnostic imaging
2-12 MHz
Ultrasound
> 20,000 Hz
Infrasound
< 20 Hz
What are the 3 acoustic variables?
pressure
density
distance
Compressions are areas of _____ pressure.
high
rarefactions are areas of ______ pressure.
low
What are the seven wave parameter?
Period, Frequency, Amplitude, Power, Intensity, Wave length, and Propagation speed.
If Frequency is increased, then Period will_______.
Decrease
If frequency increases, then propagation speed will ______.
Not change ( no relation)
What is the complementary unit to milliseconds?
Kilohertz
What is the complementary unit to seconds?
Hertz
If frequency increases, then the wavelength will _____.
decrease.
Propagation speed is affected by what two factors?
Density and Elasticity
If power output is doubled, the intensity will _______.
double
A transducer with a _____ frequency will have the maximum penetration.
Lower
If the power out put is doubled, the amplitude will _______.
increase by a factor of 4
The more stiff a medium, the ____ the propagation speed.
higher
Propagation speed in soft tissue is ______.
1.54mm/s or 1,540
