Ear:

sound has an intensity measured in w/m^{2} which leads to the decibel scale (intensity level)

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

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

1-1 |
4-3 |

Resonances:

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

last modified 02-21-05