Sound waves
Which of the following best describes sound waves?
Longitudinal, pressure waves
What are the three parameters to describe a sound wave?
Amplitude, power and intensity
Power has units of what??
Watts
When a wave’s power is doubled , the intensity is ___? When a wave’s power is quartered, the intensity is ___?
Doubled. Quartered. Amplitude is always squared.
Propagation speed is the rate of?
Which a sound wave travels through a medium
What units are used to report the pressure of a sound beam?
Pascals
Amplitude can be expressed in ____?
Decibels( db)
Can power be adjusted ?
Yes because initial power is hit like amplitude, it can be changed by the sonographer to alter the power of a wave
Wavelength is the distance or length of ___?
One complete cycle?
units for speed is what?
Meters per second. Mm/ųs or any distance divided by time
Two waves are traveling in a medium and arrive at a location at the same time. What event takes place?
Interference
Can a sonographer adjust amplitude?
Yes , a control on a basic ultrasound system allows a sonographer to alter initial amplitude of a wave.
when power increases , amplitude ___?
Also increases. They are directly related, all three parameters are directly related. Power, amplitude and intensity
Wavelength is measured in Units of?
Mm, meters
Is it adjustable by sono tech?
Hell no! Cause it only changes when speed travels from one medium to another different medium
Frequency of a sound wave is determined by what_____ only?
Sound source
Amplitude is measured from?
Baseline to the maximum or baseline to minimum
Intensity is the ____?
Concentration of energy in a sound beam. It describes the bigness of a wave.
Is wavelength adjustable by sonographer?
HELL NO
What is the speed of sound in soft tissue?
1,540 m/s
Period and frequency are _____ related?
Inversely related
what is peak to peak amplitude?
It is the difference between maximum and minimum values of an acoustic variable. It is TWICE the value of the amplitude
The units of intensity are? Is it adjustable?
The units are watts/square centimeters or W/cm2. It is adjustable because like power and amplitude they can be changed by sonographer.
Wavelength is determined by ?
Both the sound source and medium
Speed and density are ____ related? Stiffness and speed are ___ related?
Inversely. Directly.