Review of Sound Waves 
Standing Sound Waves
Viewgraphs (Knight)(103-1 fr 24; 107-1 fr 55)Boundary Conditions
| Close-Close | Close-Open | Open-Open |
|---|---|---|
| f = m v / 2L (m=1,2,3...) | f = mv/4L (m=1,3,5...) | f = m v / 2L (m=1,2,3...) |
Musical Instruments
Open vs Closed pipes: Flutes vs Clarinets
Example: Find Ear Canal Resonant Frequency (Standing Wave)
Lear canal = [2 2.5] cm; vsound~330 m/s
for open-close tube → fm = m v / 4L (m=1,3,5...)
f1 ~ 330/0.1 ~ 3300Hz
f3 ~ 10kHz f5 ~ 16kHz
Interference in General
- 1D
- 2D and 3D
- Beats