PSYB51H3 Final: PSYB51- FINAL EXAM NOTES (Ch 9-15)

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18 Aug 2013
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Vibration causes pressure changes in medium, pressure change describes as wave. Sound wave: travel at particular speed, depends on medium. Pattern of sound waves will not change as they spread out. Initial amount of pressure change dispersed over a larger and larger area as waves moves away. Basic qualities of sound waves: frequency and amplitude. Amplitude: or intensity, magnitude of pressure changes in sound wave. The difference between highest and lowest pressure area. Perceived as loudness, pressure wave is represented as sine wave. The number of times per second which pattern of pressure change repeats. Sound wave frequency is measured in hertz (hz), 1 hz = 1 cycles per second. Able to detect sound from 20 - 20,000 hz in human. Decibels(db): unit of measure for physical intensity of sound. Difference between 2 sounds in terms of ration between sound pressures db = 20 log (p / p0)

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