1. HELMHOLTZ RESONATORS

2. Bottle Band

3. More examples: Whistling Jar Pre-Columbian Whistling JarBasic Principle of Operation Image from: http://www.prices4antiques.com/ Image from: http://www.mountainsocarina.com/lessons/lesson02-a7b.html

4. Yet more examples: The Ocarina Ocarinas Basic Principle of Operation

5. Spring Mass System in Disguise Air plug in neck “bobs” in a big sea of air molecules

6. Resonant Frequency v sound velocity of sound waves in air L length of plug of air in neck S neck cross-section V chamber volume of air

7. Assumptions…you know what they say Which variable(s) is changing among these Coke bottles? How do these Coke bottles compare to the simple physics model? How would you determine S, L, and V?

8. Lab Experiment Tune bottles Compare actual frequency to theory Do better than these guys!

9. Resources Univ of New South Wales Acoustical Physics group: http://newt.phys.unsw.edu.au/jw/Helmholtz.html Eric Heller’s “Why you hear what you hear” chapter 13: http://www.whyyouhearwhatyouhear.com/subpages/chapter13.html http://www.whyyouhearwhatyouhear.com/subpages/chapter13.html Mountain Ocarinas: http://www.mountainsocarina.com/lessons/lesson02-a7b.html http://www.mountainsocarina.com/lessons/lesson02-a7b.html The Bottle Boys website: http://www.thebottleboys.comhttp://www.thebottleboys.com