Grooves on a Record - LP

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 Code Number :   3C20.23? 

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.

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Condition :   Good  
Principle :   Mechanical Vibrations Converted to Sound.  
Area of Study :  Acoustics   
Equipment :   Turntable with mirror and needle attached to tracking arm, laser.
Procedure :   Place the LP record onto the turntable.  Place the needle on the 4th track of the E. Powers Biggs record and align the laser to reflect off the mirror and onto the opposite wall of the lecture room.  The vibrations of the needle as it moves over the grooves at constant speed are shown with the large amplitude vibrations giving the largest movements of the laser beam on the wall. 
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Mail Questions and Comments to:  Dale Stille