Chapter 16 Sound /good-and-bad-vibrations.html

Introduction Our approach –Sound is mainly a special case of a longitudinal wave –Context for studying more wave phenomena, including Interference Quality Beats Doppler effect Shock waves

Sound waves, in particular Wave speed and its dependence on –Density –Temperature –Material Frequency –Pitch –Audible range, ultrasonic & infrasonic –Loudness – later Wave nature –Adiabatic vs isothermal

Mathematical representation In terms of displacement as previously studied –Review In terms of pressure –See phase relation, fig 16-3

Intensity of Sound Intensity (power/area) & Loudness (a human perception) Sound level (decibels) –Definition –Examples –Response in relation to frequency (fig 16-6)

Production of musical tones On strings and in tubes –Diagrammatic representation –Resonance/standing wave condition –Demonstration Quality –Definition – ndingWaves1/StandingWaves1.htmlhttp://id.mind.net/~zona/mstm/physics/waves/standingWaves/sta ndingWaves1/StandingWaves1.html –Examples (fig 16-14) –Missing harmonic phenomenon

Interference Constructive & Destructive interference Interference patterns (more later) Beats – sition.htmlhttp:// sition.html –Demonstration –Visual beats

Doppler Effect Nature of the phenomenon – Summary formula Doppler effect with light Examples Shock waves –

the end