Waves: Sound

touchtone files


sound has an intensity measured in w/m2 which leads to the decibel scale (intensity level)

there also a relative intensity level allowing you to compare two sounds directly

Beat frequncy

Doppler, Fourier, Lissajous, Chladni, Mach, Bell

Mach # = v source / v wave Doppler Effect   M# > 1 sonic boom, shock wave, (water - bow wave)

Lissajous patterns: the interference of two waves moving perpendicularly to each other allowing an unknown frequency to compared to a known frequency





chladni plates:

Fourier: Complex waves can be simplified to a series of sine waves

last modified 02-21-05