Sound Variables Flashcards
Sound definition
A series of compressions and rarefactions; a wave that carries energy from one place to another
How is sound created?
By an object vibrating
Sound must travel through…
… a medium
Sound waves are….
… mechanical and longitudinal
How are Acoustic Variables related to sound?
Acoustic variables identify what waves are sound waves.
What are the acoustic variables?
Pressure, density, distance
Pressure definition and units
Concentration of force in an area; units of pascals (Pa) or force/area
Density definition and units
Concentration of mass or weight; units of volume ie. (kg/cubic cm)
Distance definition and units
Measure of particles’ motion; units of distance (mm, cm)
What are the 7 parameters of sound and what do they do?
7 parameters of sound describe sound waves; period, frequency, amplitude, power, intensity, wavelength, and speed
Period definition
The amount of time required to repeat 1 cycle
Determined by sound source
Frequency definition
The number of certain events that occur in a particular time duration; in this case, the number of cycles of an acoustic variable in one second.
Determined by the sound source.
Period units
Units of time (microseconds); typical value: 0.06-0.5usec
Frequency units
Units: per sec or Hz
Typical value: 2MHz-15MHz
