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Students may raise their final grades by as much as 15% by completing extra-credit projects from the list below.

All extra credit is due by the last day of class (Wednesday, 3/13/13).


- [Chapter 3] Read the article on outdoor sound propagation in the Civil War and write up a report.

- [Chapter 4] Make graphs of amplitude and phase vs. frequency for the Driven Harmonic Motion Analyzer. Use two different values of damping.

- [Chapter 5] Determine the speed of sound in the bumpy hose by multiplying frequency times wavelength for several harmonics.

- [Chapter 9] Read the chapter and answer the questions for Exercises 1-9 on p. 190 of the text.

- [Chapter 12] A challenging extra credit project would be to build an impedance head and to measure the impedance of one or more wind instruments.

         Professor Peter Hoekje conducted such a workshop at CCRMA in 2006, and we have copies of the instructions he wrote for this workshop. As a sound source, this design uses a piezoelectric buzzer disk, which has a high acoustical impedance, and therefore provides a nearly constant acoustic flow. A small electrical microphone then senses the pressure at the input, and this will then be proportional to the input impedance.

- [General] Carry out an activity from the Experiments for Home, Laboratory, and Classroom Demonstration section at the end of a chapter from the text (consult with Professor Rossing first).

- [General] Implement a project, experiment, or research report on a topic of your choosing (consult with Professor Rossing first).


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