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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)