WAVES AND OSCILLATIONS - WAVE MOTION - DOPPLER EFFECT	NC State University Faculty Access
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Description: A buzzer and battery are in a tennis ball at the end of a long string. Whirl the buzzer in a horizontal circle over your head. Point out the difference in sound between the moving and stationary buzzer. Purchased/Built: built Setup Time: none Quant. in Demo Room: 1 Demo References The Video Encyclopedia of Physics Demonstrations Disc 10-21 Mount two speakers on a rotating frame and attach to an audio oscillator through slip rings. Freier and Anderson Si-3 A battery operated oscillator drives a speaker mounted on a 3' turntable. The American Journal of Physics AJP 41(5),727 Attach a Sonalert to a 2 m string and the shift is almost a minor third. MORE: interference and radiation resistance. The American Journal of Physics AJP 29(10),713 Mount a buzzer and a battery on opposite ends of a meter stick and rotate about the center of mass.
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