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| Discuss the physics behind the demonstration, explaining some of the various steps of the demonstration when appropriate. | There are at least 3 variations of this demonstration. The below photos show the various appropriates. The First organ pipe has a slide-able card, located at the mid point of the air column, with a hole only on one end. With the card pushed in, thus the hole is within the organ pipe, and with low to moderate air flow. The organ pipe acts like an open-open tube resonator of length L. When the card is pulled out, there by closing the organ pipe at the mind point. The pitch of the sound then drops by a factor of 4 and now acts like a open-closed tube resonator to L/2. drawing:twikiTest.tdraw |
[:PiraScheme#WavesSound: Table of Waves and Sound Demonstration] |
[:WSEquipmentList: Wave and Sound Equipment List] |
[:Demonstrations:Lecture Demonstrations] |
Open and Closed End Organ Pipes, 3D32.25
Topic and Concept:
Instruments, [:Instruments#AirColumn: 3D32. Air Column Instruments]
Location:
Cabinet: [:WavesSoundCabinet: Waves and Sound (WS)]
Bay: [:WSCabinetRtBayA2:(A2 Right)]
Shelf: #1&2
attachment:OpenClosedPipes02-400.jpg
Abstract:
Three organ pipes, open and closed.
Equipment |
Location |
ID Number |
|
|
|
Organ Pipes |
[:WSCabinetRtBayA2: WS, Bay A2 Right, Shelf #1&2] |
|
Base with Air Hose |
[:WSCabinetRtBayA2: WS, Bay A2, Shelf #1] |
|
[:RedWhiteGasCart: Red and White Gas Cart] |
Located under lecture bench in rooms 2103 and 2241 |
|
Important Setup Notes:
This demonstration requires a supply of compressed air (usually from the [:RedWhiteGasCart:red and white gas carts]).
Setup and Procedure:
- List steps for setup then procedure.
- ...
Cautions, Warnings, or Safety Concerns:
If using the [:RedWhiteGasCart:red and white gas carts], make sure you are using compressed air and NOT METHANE gas which is highly flammable.
Discussion:
There are at least 3 variations of this demonstration. The below photos show the various appropriates.
The First organ pipe has a slide-able card, located at the mid point of the air column, with a hole only on one end. With the card pushed in, thus the hole is within the organ pipe, and with low to moderate air flow. The organ pipe acts like an open-open tube resonator of length L. When the card is pulled out, there by closing the organ pipe at the mind point. The pitch of the sound then drops by a factor of 4 and now acts like a open-closed tube resonator to L/2.
drawing:twikiTest.tdraw
attachment:OpenClosedPipes01-250.jpg |
attachment:OpenClosedPipes03-250.jpg |
attachment:OpenClosedPipes04-250.jpg |
attachment:OpenClosedPipes05-250.jpg |
attachment:OpenClosedPipes06-250.jpg |
attachment:OpenClosedPipes07-250.jpg |
attachment:OpenClosedPipes08-250.jpg |
attachment:OpenClosedPipes09-250.jpg |
Videos:
[https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]
References:
[https://en.wikipedia.org/wiki/Organ_pipe Wikipedia - Organ Pipe]
[http://hyperphysics.phy-astr.gsu.edu/hbase/music/aircol.html Hyperphysics - Air Column Instruments]
[:Instructional:Home]