PSYCH 1XX3 Chapter Notes - Chapter 11.3: Sound, Logarithmic Scale, Vocal Folds
18 Apr 2017
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Module 11. 3 audition (the stimulus sound waves) Sound waves are vibrations in air particles: like light, sound travels in waves, unlike light, sound waves travel much slower and require some medium to travel through. Condensed bands of air particles ripple away from the sound source. The eardrum responds to air pressure changes -- bands of air molecules push the eardrum inwards and outwards: compressed air particles push it inwards, less dense air particles move it outwards. Pressure changes in sound waves can be graphed as a sine wave. o. Perceived loudness of a sound doubles for every 10 db increase. A normal conversation takes place at ~60 db, a whisper at ~27 db, a rock concert at ~120 db. So if many wave peaks are condensed into one second, the result will be a high frequency which = high-pitched sound: many sound frequencies exist outside our detectable range.
