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30 Cards in this Set
- Front
- Back
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SOUND
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Series of vibrations of molecules in a medium
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What are mediums?
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Gas (air)
Liquid (underwater) Solids (dividers in classrooms) |
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Amplitude
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Strength of vibration of molecules
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PEAK AMPLITUDE
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The amount of amplitude at max. points of displacement
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PEAK-PEAK AMPLITUDE
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Amplitude from 1 point of max. displacement to another [add together-take absoulute value].
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RMS AMPLITUDE
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[Root Mean Average]
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INSTANTEOUS AMPLITUDE
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The measure of amplitude at any point in time along the wave.
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For sine waves to find RMS Amp.
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Peak Amp * .707 (1/2 sq. rt of 2 )
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Starting Phase
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where vibrations begin in degress
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Instant. Phase
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Measure of phase on any point on wave.
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Wavelength
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The distance between 2 consecutive pos. peaks or neg. peaks on a sine wave
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How many cycles is completed in 1 second?
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2
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1 cycle is how many seconds?
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0.5
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Wavelength is affected by what?
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Frequency and speed of sound in air
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Intensity
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A measure of sound strength
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Types of Decibels
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dBSPL
dBIL dBSL dBHL |
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dBSPL
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Decibel Sound Pressure Level
{ reference pressure } |
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dBIL
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Decibel Intensity Level
{ Power } |
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dBSL
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Decibel Sensation Level
{Comp. of 1 decibel lever to another } |
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dBHL
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Decibel Hearing Level
{ Clinical Decibel } |
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dBSPL Needs what?
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Measure pressure
Reference Pressure |
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What amplitudes are independant and which are time???
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Instanteous (TIME)
PEAK ind. PEAK-PEAK ind. RMS ind. |
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Cycle of Increased Pressure
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Compression Phase
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Cycle of Decreased Pressure
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Rarafaction Phase
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Describing SHM (simple harmonic motion)
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Frequency
Period Amplitude Phase Wavelength |
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Frequency
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# of cycles per second of time.
Units= Hertz (Hz) |
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Period
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Amount of time it takes to complete 1 cycle
Units=Time (T) |
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Inertia
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Force must be acted on an object to make it move
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Elasticity
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Ability of an object to return to initial position after movement
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Max. Displacement
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How much an object can go to (how Far)
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