PSYC 2390 Lecture Notes - Lecture 18: Semicircular Canals, Stiletto Heel, Stapedius Muscle

• School: University of Guelph
• Department: Psychology
• Course: PSYC 2390
• Professor: Naseem Al- Aidroos

Document Summary

The molecules push up against each other producing a pressure wave (wave of compression). compressing molecules then spreads them apart. Compression causes air pressure to be higher than normal. Sound doesn"t travel as quickly through air as through water or metals: properties of a sound wave, amplitude. Half the height of the wave; corresponds to loudness. Loud sounds are to long amplitudes, soft sounds are to short amplitudes. Spl (sound pressure levels); looking at how much force a pressure wave can produce on a certain area. Measured in dynes (force accelerate a gram of weight cm/cm accelerate. Dyne/ cm (squared) = 0. 0002 dynes/cm (squared) Decibel (db) = 20log(sound pressure of sound in question / sound pressure of the softened sound we can hear). Count up number of waves that hit your ear in a matter of time. Lowest sound that can be hear is around 27 hz. Highest sound that can be heard is around 4000 hz.