BIOL 4041 Lecture Notes - Lecture 14: Inverse-Square Law, Sonic Boom, Sound
Document Summary
Spreading loss: sound intensity decreases with square of distance: inverse square law, nd intensity at any distance by: Measuring intensity at one know distance from source. Or by know intensity at source (unusual; more dif cult) When multiple sources or echoes can make sound unbearable. Combining sounds with different frequencies: have both constructive and destructive interference, new frequency: beat frequency (wah, wah, wah) Dissonance: when the length of string segments (frequency ratios) are far from integers. Sonic boom: sound associated with the shock waves created by an object traveling through the air faster than the speed of sound; ampli ed doppler effect. Super sonic: moving even faster than sonic boom; sound wave is actually behind source. Depending on object density of location; sounds can appear much different. Spectograms of songs of different populations of a eurasian songbird: bird singing in forest (sweden) - don"t sing as high of frequencies.
