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| ||Function Generator||[:WSCabinetRtBayB1: WS, ME, Bay B1, Shelf #2]|| || ||BNC cables||?|| || |
||Function Generator||[:EMCabinetLtBayB1: WS, Bay B1 Left, Shelf #2]|| || ||Coaxial Cables||Located in rod and tackle cabinet near main lecture halls|| || |
[:PiraScheme#WavesSound: Table of Waves and Sound Demonstration] |
[:WSEquipmentList: Wave and Sound Equipment List] |
[:Demonstrations:Lecture Demonstrations] |
Two Speaker Interference, 3B55.10
Topic and Concept:
Wave Motion, [:WaveMotion#InterferenceOfSound: 3B55. Interference and Diffraction of Sound]
Location:
Cabinet: [:WavesSoundCabinet: Waves and Sound (WS)]
Bay: [:WSCabinetRtBayA1:(A1 Right)]
Shelf: T
attachment:TwoSpeakerInterference01-400.jpg
Abstract:
Two speakers driven from a common source are mounted at the ends of a 1 m rotatable bar.
Equipment |
Location |
ID Number |
|
|
|
Speakers Mounted on 1 m Bar on a Stand |
[:WSCabinetRtBayA1: WS, Bay A1, Shelf T] |
|
Function Generator |
[:EMCabinetLtBayB1: WS, Bay B1 Left, Shelf #2] |
|
Coaxial Cables |
Located in rod and tackle cabinet near main lecture halls |
|
Important Setup Notes:
- N/A
Setup and Procedure:
- Place stand on tabletop.
- Using a right-angle bracket, connect the 1 m bar with mounted speakers at the center to the stand.
- Plug in the function generator nearby.
- Connect the speakers to the function generator using BNC cables. Only one speaker needs to be connected (the two are connected internally).
- Choose a function (sine works well) and frequency.
- You can move locations of constructive and destructive interference by rotating the 1 m (need to loosen right-angle clamp first).
Cautions, Warnings, or Safety Concerns:
- N/A
Discussion:
Sound waves obey the principle of superposition. When two sound (pressure) waves encounter one another, they interfere. Spatially, the resultant wave has alternating spots of constructive and destructive interference.
attachment:TwoSpeakerInterference02-250.jpg |
attachment:TwoSpeakerInterference03-250.jpg |
attachment:TwoSpeakerInterference04-250.jpg |
Videos:
[https://www.youtube.com/user/LectureDemostrations/videos?view=1 Lecture Demonstration's Youtube Channel]
References:
[https://en.wikipedia.org/wiki/Interference_%28wave_propagation%29 Wikipedia - Interference]
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