Demonstrations

Doppler Effect - Rotator App.

Code Number :	3B40.25
Disclaimer:	Reprinted by permission of Dick Berg, University of Maryland, for use on this website. The demonstrations contained and referenced herein are listed for the purposes of cataloging and describing physics demonstrations which should be conducted only under the direction of a trained instructional support professional or physicist. These demonstrations are not presented for the purpose of being conducted by persons unconnected to this Facility and/or persons not consulting with or being supervised by the recognized instructional support professional or physicist and his/her staff. The University is responsible only for those demonstrations carried out using its own equipment using established safety and scheduling policies, and bears no responsibility for those choosing to use this source material for their own purposes. All demonstrations described and contained herein are public domain, and can also be found in reference materials in libraries, bookstores, and electronic sources. Further information regarding legal liability in use of demonstrations and labs will be found on the web site Injuries in School/College Laboratories in USA. The University of Iowa Disclaimers: University of Iowa Disclaimer All Rights Reserved..
Condition :	Excellent
Principle :	Doppler Effect on Sound Waves
Area of Study :	Acoustics
Equipment :	Reed on arm, Piezo Buzzer with battery on arm, Variable Speed Rotator, Wave generator, Amplifier, Speaker (small) on yardstick.
Procedure :	Make sure the rotators are in good shape. Tighten the desired arm securely and rotate at the desired speed. CAUTION: Stay out of the way of the rotating arm when adjusting the speed. Plug the generator into the auxiliary input of the amplifier. Plug the speaker that is on the yardstick into the speaker outputs of the amplifier. Swing the speaker back and forth and listen to the Doppler shift.

References

Marcelo M. F. Saba and Rafael Antonio da S. Rosa, "The Doppler Effect of a Sound Source Moving in a Circle," TPT, Vol. 41, # 2, p. 89, (Feb. 2003).

Herbert T. Wood, "Mechanical Analogue of the Doppler Effect", TPT, Vol. 30, # 6, Sept. 1992, p. 340.

V. Slusarenko, C. H. Worner, "Graphical Representation of the Classical Doppler Effect", TPT, Vol. 27, # 3, Mar. 1989, p. 171.

S. K. Chakarvarti, "The Doppler Effect: A Simple Analogy and Demonstration", TPT, Vol. 19, # 4, Apr. 1981, p. 320.

Donald E. Tilley, "Special Relativity and the Doppler Effect", TPT, Vol. 13, # 9, Dec. 1975, p. 560.

Vincent Mallette, "Doppler Effect Using A High Frequency Buzzer", TPT, Vol. 10, # 5, May 1972, p. 283.

Melvin Jones, "A Demonstration of the Doppler Principle", TPT, Vol. 13, # 2, Feb. 1975, p. 109.

L. Muldawer, "New Acoustic Doppler-Shift Experiments", AJP, Vol. 35, # 12, Dec. 1967, p. 1136.

Si - 3: Freier and Anderson, A Demonstration Handbook for Physics.

W- 380: "Fork, Rod and Reed," DICK and RAE Physics Demo Notebook.

Mail Questions and Comments to: Dale Stille