Acoustics - 2-2 - Frequency Rate of times/second one cycle...

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Frequency Rate (# of times/second one cycle is completed) Measured in Hertz (Hz) or cycles per second (cps) Psychological correlate = pitch
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Intensity Degree or amplitude of particle displacement Measured in decibels (dB) Psychological correlate = loudness
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Time Period (time it takes for one cycle to complete) Measured in seconds of milliseconds (reciprocal of frequency - 1/f) Psychological correlate = duration
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Wavelength The distance a wave travels during one cycle (inversely related to frequency) Measured in feet per second Psychological correlate = pitch
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Speed of sound = 1130’ per second 344 meters/sec 758 mph Frequency = 1130’ /wavelength Wavelength = 1130’ /frequency Time = wavelength/1130 Wavelength = time x 1130
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Sound travels faster through liquids than air. Because of its density and elasticity, water is an excellent transmitter of sound. Engine noise from a sub can travel thousands of miles in the ocean, especially if in a “ deep sound channel Speed of sound in ocean = 1500 meters/sec (5x faster than air) Sound travels fastest through solids because elasticity and density directly affect velocity
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