## Physics 371 Demonstrations

Here is a composite list of demos that have been used for this course in the past and are grouped by Lecture days. This list is only a reference guide and may differ from actual demos used in lecture depending on which faculty is teaching this course.

Thanks to Paul Terry for helping with this Draft

Lecture 1

• Torsion Bar Wave Board
• Horizontal Rope tied to the anchors at either end of the room with tension applied
• Tuning forks with mic and scope to show wave form
• Big rubber band with folded paper projectile

Lecture 2

• Mic and Scope for wave form analysis along with a few instruments: violin, trumpet, recorder
• Hooke’s Law Spring
• Loop-the–Loop
• Any Misc simple harmonic motion
• Big rubber band with folded paper projectile
• Air track with carts

Lecture 3

• repeat last Lecture 2
• Big vertical spring
• Energy Tracks (Ball bearing on parabolic track)
• Simple U tube with fluid
• Horizontal two-mass rope set up that shows the two speeds of propagation.

Lecture 4

• SF6 and H Gases for inhaling

• Organ pipes and some liquid nitrogen
• Frozen coronet - on this one I'll actually come down in the morning to tune the coronet and then stick it in the freezer.

Lecture 5

• Repeat Helium and balloon
• 2 tuning forks at same frequency with one with weights to attachments frequency; mic and scope to show beat wave pattern

Lecture 6

• Interference pattern of concentric circle (Two Transparencies)
• Old style Ripple Tank, with single, double slits and plane wave
• Standing wave on a String with Strobes

Lecture 7

• Standing wave on a String with Strobes
• Standing wave tube with sliding microphone and scope

Lecture 8

• Standing wave tube with sliding microphone and scope
• Guitar
• String that goes across the room from the loops. All I want to do here is show that the propagating wave, after reflections, starts looking more like a standing wave. There is probably an optimal tension for seeing the effect, maybe even an optimal string thickness.
• Cable for hooking up my computer to play a guitar recording from an MP3 file.

Lecture 9

• Standing wave tube with sliding microphone and scope
• Organ pipe bellows and wood pipes (especially the one with the sliding end piece)

Lecture 10

• Hooke’s Law Spring
• Standing wave tube with sliding microphone and scope
• Tuning forks

Lecture 11

• Exam day, no demos are needed.

Lecture 12

• Fourier Analysis Stuff

• Voce Vita set up with mic for real time analysis of trumpet, violin, flute, etc.
• Your daughter's Electric Keyboard if you can borrow it
• Nine-harmonic Fourier synthesis box. I think you usually set this one up to build a square wave.

Lecture 13

• Real time Fourier analysis with mic
• Your daughter's keyboard if you can borrow it.
• Fourier synthesis box with square wave form set up on it.

Lecture 14

• Play audio from my computer

Lecture 15

• CD, Phillips Sound demos from my laptop

Lecture 16

• CD, Phillips Sound demos from my laptop
• Is there a model of the ear that can be used as a visual aid? (NO!)

Lecture 17

• Timpani with real time Fourier analysis (mic, projection on wall).

Lecture 18

• Timpani
• Real time Fourier transform

Lecture 19

• I will be doing the Phillips sound demos with my laptop.
• Monochord with mic. (Scope?)

Lecture 20

• I am bringing in the clavichord and we’ll need a mic.

Lecture 21

• Exam today, so no demos.

Lecture 22

• Casio keyboard with mic and real time Fourier analysis
• Steinway piano action

Lecture 23

• Steinway piano action demo
• Phillips sound demos - all I need here is just the hook up from my computer to the sound system
• Inharmonicity in metal bars, chimes, etc., and this would involve Fourier analysis.

Lecture 24

• Projection capability for graphics from my computer
• Organ pipe demos.

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