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30 Cards in this Set

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SOUND
Series of vibrations of molecules in a medium
What are mediums?
Gas (air)
Liquid (underwater)
Solids (dividers in classrooms)
Amplitude
Strength of vibration of molecules
PEAK AMPLITUDE
The amount of amplitude at max. points of displacement
PEAK-PEAK AMPLITUDE
Amplitude from 1 point of max. displacement to another [add together-take absoulute value].
RMS AMPLITUDE
[Root Mean Average]
INSTANTEOUS AMPLITUDE
The measure of amplitude at any point in time along the wave.
For sine waves to find RMS Amp.
Peak Amp * .707 (1/2 sq. rt of 2 )
Starting Phase
where vibrations begin in degress
Instant. Phase
Measure of phase on any point on wave.
Wavelength
The distance between 2 consecutive pos. peaks or neg. peaks on a sine wave
How many cycles is completed in 1 second?
2
1 cycle is how many seconds?
0.5
Wavelength is affected by what?
Frequency and speed of sound in air
Intensity
A measure of sound strength
Types of Decibels
dBSPL
dBIL
dBSL
dBHL
dBSPL
Decibel Sound Pressure Level
{ reference pressure }
dBIL
Decibel Intensity Level
{ Power }
dBSL
Decibel Sensation Level
{Comp. of 1 decibel lever to another }
dBHL
Decibel Hearing Level
{ Clinical Decibel }
dBSPL Needs what?
Measure pressure
Reference Pressure
What amplitudes are independant and which are time???
Instanteous (TIME)
PEAK ind.
PEAK-PEAK ind.
RMS ind.
Cycle of Increased Pressure
Compression Phase
Cycle of Decreased Pressure
Rarafaction Phase
Describing SHM (simple harmonic motion)
Frequency
Period
Amplitude
Phase
Wavelength
Frequency
# of cycles per second of time.

Units= Hertz (Hz)
Period
Amount of time it takes to complete 1 cycle

Units=Time (T)
Inertia
Force must be acted on an object to make it move
Elasticity
Ability of an object to return to initial position after movement
Max. Displacement
How much an object can go to (how Far)