Transcription of The Doppler Effect of a Sound Source Moving in a Circle
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The Doppler Effect of a Sound Source Moving in a Circle
THE PHYSICS TEACHER Vol. 41, February 2003 DOI: I first heard about an experiment thatillustrates the Doppler Effect by twirling abuzzer around one s head,1I was in-trigued and wondered if this experiment would workor not. In fact, it works because you usually do notplace both ears exactly in the center of the Circle ; thiswould be very difficult indeed. When the sourcemoves in a Circle , the distance from the center is al-ways constant, and there is no approaching or reced-ing velocity at all. Holding a microphone in the samehand that holds the string that is attached to thebuzzer easily shows this simple fact. No Doppler ef-fect is observed. Although several qualitative demon-strations and experiments of the Doppler Effect havebeen published,1,2only a very few quantitative experi-ments are found in the devised anew method to quantify the Doppler Effect , describedin a previous article,4we thought it would be a goodphysics and geometry exercise to calculate and mea-sure the frequency variations when the microphone isplaced on the circular path of the SetupIn order to do that, the apparatus shown in Fig.
THE PHYSICS TEACHER Vol. 41, February 2003 DOI: 10.1119/1.1542044 89 W hen I first heard about an experiment that illustrates the Doppler effect by twirling a
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