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Physics 145 Introduction to Experimental Physics I Instructor: Karine ChesnelPowerPoint Presentation

Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel

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Introduction to Experimental Physics I

Instructor: KarineChesnel

Office: N319 ESC

Tel: 801- 422-5687

Office hours: on appointment

Class website:

http://www.physics.byu.edu/faculty/chesnel/physics145.aspx

detector

Oscillation

visual meter

oscillator

Driving Force

device

Damping

element

Mechanical resonators

A. Damped Mass-Spring Oscillator

- L10.1: Set up apparatus
- L10.2: Predict the resonance frequency of oscillator
- (measure m, k, and b)
- Simulate the frequency response
- L10.3: Measure the frequency response of the oscillator
- - measure the peak-to-peak amplitude at each point
- (wait for stabilization for each point in frequency)
- - plot your data App vs. f
- L10.4: Fit the data to resonance peak (in Mathematica)
- - deduct a refined value for k and for b

Music instruments

Helmholtz resonator

Helmholtz resonator

See derivation at

http://www.phys.unsw.edu.au/jw/Helmholtz.html

Helmholtz resonator experiment

B. Helmholtz Resonator

- L10.5: Play with the resonator (blow into it)
- L10.6: Set the experiment up
- - Locate the resonance frequency
- - optimize the position of the speaker
- L10.7: Measure the frequency response of the resonator
- with a microphone (plug into computer jack)
- Create a Labview program to read the signal
- and sample at 20kHz, over 0.1s
- L10.8: Map out the frequency response
- L10.9: Measure the resonance frequency
- and compare with prediction (measure A, V and l)

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