Bulletin of the American Physical Society
2007 Ohio Section of the APS Spring Meeting
Volume 52, Number 5
Friday–Saturday, May 4–5, 2007; Ypsilanti, Michigan
Session C1: General Physics |
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Chair: Alexandria Oakes, Eastern Michigan University Room: EMU Student Center 320 |
Saturday, May 5, 2007 8:00AM - 8:12AM |
C1.00001: Measuring the Acoustic Impedance of Pipes and Musical Instruments Herbert Jaeger Using a small electret microphone and a piezo-buzzer we have constructed a simple impedance transducer to measure the input impedance of air columns, such as cylindrical pipes, as well as musical instruments. The input impedance of an air column is given as the ratio of the pressure to the volume flow of air at the input of the air column. The microphone serves as the pressure transducer, while the piezo-buzzer is controlled to provide a constant velocity amplitude. Therefore the microphone signal is proportional to the acoustical impedance and, if required, can be calibrated using a simple air column for which the impedance can be calculated. This impedance transducer is currently in use as demonstration equipment for a physical acoustics class. It is simple to use and robust, so that it is well-suited for an undergraduate introductory laboratory environment. This talk will discuss the function of the impedance transducer and show examples of the type of measurements that can be performed. [Preview Abstract] |
Saturday, May 5, 2007 8:12AM - 8:24AM |
C1.00002: The Classical Electromagnetic Field: Covariant Definition and Novel Symmetries William Baylis A simple classical electromagnetic field F can be viewed as a plane (2-form or bivector) in spacetime. An inertial observer naturally splits F into electric and magnetic components, which are usually defined separately. However in a classical eigenspinor approach, the covariant field F can be defined operationally by the spacetime rotation rate it induces in a moving charge. This simple geometric view leads to novel symmetries that will be explored in the talk. [Preview Abstract] |
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