#acl snarf:read,write,delete,revert,admin FacultyGroup:read,write All:read
||<30%  style="text-align:center">[[PiraScheme#WavesSound|Table of Waves and Sound Demonstration]] ||<30%  style="text-align:center">[[WSEquipmentList|Wave and Sound Equipment List]] ||<30%  style="text-align:center">[[Demonstrations|Lecture Demonstrations]] ||


= Two Speaker Interference, 3B55.10 =
'''Topic and Concept:'''

 . Wave Motion, [[WaveMotion#InterferenceOfSound|3B55. Interference and Diffraction of Sound]]

'''pira200 Listed'''

'''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.
||<40%  style="&quot; ;text-align:center">'''Equipment''' ||<30%  style="text-align:center">'''Location''' ||<25%  style="text-align:center">'''ID Number''' ||
|| || || ||
||Speakers Mounted on 1 m Bar on a Stand ||[[WSCabinetRtBayA1|WS, Bay A1, Shelf T]] || ||
||Function Generator ||[[EMCabinetLtBayB1|EM, 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:'''

 1. Place stand on tabletop.
 1. Using a right-angle bracket, connect the 1 m bar  with mounted speakers at the center to the stand.
 1. Plug in the function generator nearby.
 1. Connect the speakers to the function generator using BNC cables. Only one speaker needs to be connected (the two are connected internally).
 1. Choose a function (sine works well) and frequency.
 1. 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_(wave_propagation)|Wikipedia - Interference]]

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