PSYCH 3A03 Lecture Notes - Sound Intensity, Psych, Inverse-Square Law

• School: McMaster University
• Department: Psychology
• Course: PSYCH 3A03
• Professor: Paul Faure

Document Summary

This outline summarizes major points covered in lecture. It is not intended to replace your own lecture notes. Proportional to velocity of system; sound pressure is proportional to air particle velocity. P(t) = (m v) / (t area), where m=mass, v=velocity, t=time. Energy ability to do work, flows through medium. Power rate of energy transfer through medium, rate at which work is accomplished. Sound energy energy unit = joule (j) = 1 n m. Sound power (w) energy unit = watt (w) = 1w = 1 j/s = 1 n m/s. Note: sound energy and sound power are proportional but are not equivalent to each other. Sound intensity ( ) energy unit = watt/m2 (w/m2) = 1 j/s m2. Sound intensity amount of energy that is transmitted per second through an area of one square meter. Acoustical energy from point source in expanding spherical wave front. Relative measures used as a reference for stating relative magnitude.