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# Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel - PowerPoint PPT Presentation

Physics 145 Introduction to Experimental Physics I Instructor: Karine Chesnel Office: N319 ESC Tel: 801- 422-5687 [email protected] Office hours: on appointment Class website: http://www.physics.byu.edu/faculty/chesnel/physics145.aspx . Lab 11 Mechanical & Acoustical

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Introduction to Experimental Physics I

Instructor: KarineChesnel

Office: N319 ESC

Tel: 801- 422-5687

[email protected]

Office hours: on appointment

Class website:

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

Mechanical & Acoustical

Resonators

Spring – mass resonator

Pendulum

• In motion

- kx

- bv

mg

Fexternal

Mechanical resonators

Second Newton’s law

• Complex notation

Mechanical resonators

- kx

- bv

mg

F0

detector

Oscillation

visual meter

oscillator

Driving Force

device

Damping

element

Mechanical resonators

Amplitude

Peak to peak

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)