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experiment3

# experiment3 - PHYSICS 1021 Experiment 3 Sound and Resonance...

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PHYSICS 1021 Experiment 3 Sound and Resonance

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PHYSICS 1021 Experiment 3 Prelab Questions These questions need to be completed before entering the lab. Please show all workings. Prelab 1 What information is contained in the FFT graph? Prelab 2 What do you expect for the shape of a frequency vs harmonic number graph? Explain.
PHYSICS 1021 Experiment 3 Contents Part I: Introduction and Set-up Part II: Beat Frequency Part III: Resonance in a tube Part IV: Summary

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PHYSICS 1021 Experiment 3 Part I: Introduction In today's experiment, you will examine beat frequency using tuning forks, a microphone and LoggerPro. You will also produce resonance in a tube open at both ends and use your results to determine the speed of sound in air.
PHYSICS 1021 Experiment 3 Fast Fourier Transform (FFT) Sound waves in air travel as pressure variations through motion of the air molecules. The pressure variations are sinusoidal with time. Taking a Fast Fourier Transform of a sinusoidal waves shows the frequency of that sine or cosine wave. EXAMPLE: A tuning fork produces a sinusoidal pressure wave as is shown below. Taking the FFT indicates the frequency of the wave which is the same as the frequency of the tuning fork. If a wave (or sound) is composed of many frequencies, the FFT will show all frequencies present in that sound.

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Part II: Beats
PHYSICS 1021 Experiment 3 Part II: Beats Apparatus Microphone 2 tuning forks - 512 Hz - 480 Hz You will have a microphone as shown in the photograph. The active element (transducer) is the 9 mm diameter disk located on one end of the plastic case. The cord should be plugged into the CH1 socket on the LabPro.

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PHYSICS 1021 Experiment 3 Part II: Beats Experimental Method Launch the LoggerPro program by clicking on the icon below.
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experiment3 - PHYSICS 1021 Experiment 3 Sound and Resonance...

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