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Measuring Sound Waves with Oobleck
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Visualizing Sound Waves with Oobleck
What is Oobleck?
Revise and Redo
Oobleck Viscosities
Normally, oobleck is made with three parts cornstarch to one part water. To determine what viscosity of obleck would give us the best result we also experimented with a thinner solution (lower viscosity) and a thicker solution (higher viscosity).
Normal Oobleck 3:1
Thick Oobleck 5:1
To actually do our experiment we first attached the wires from the function generator to the speaker. We then poured one of the three oobleck mixtures on the plastic wrap covering the speaker. Using the function generator we tested each oobleck mixture's motion for a series of frequencies. This process of testing the oobleck's motion as the frequency was changed was repeated for each oobleck mixture, each differing in viscosity level.
10 Hertz
14 Hertz
20 Hertz
40 Hertz
Conclusion
After we completed our revised experiment we came to the conclusion that the higher viscosity oobleck demonstrated more motion at frequencies between 20 and 40 Hertz
2 Hertz
We chose to test the following frequencies in our expirment...
100 Hertz
Thin Oobleck 1:2
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Initially we were trying to identify which frequencys, low or high, gave us the maximum results when measuring sound waves with oobleck on the speaker generating the sounds. After attempting to do this experiment we were unsuccesful in gathering any data. Therefor we chose to revise our experiment objective so that instead of focusing so much on the varying frequencys impact on the oobleck motion we focused on how changing the viscosity of the oobleck solution would affect our results.
Oobleck is a mixture of cornstarch and water. The ratio of normal oobleck is 3 parts cornstarch to one part water. Oobleck is also categorized as a non-Newtonian fluid, meaning that it acts as both a liquid and a solid. Oobleck becomes solid when pressure is applied and liquid when it is able to flow freely without any force applied.
This video shows the results we got from using the lowest viscosity oobleck.
Before you watch the videos from our experiment this result is what you should be looking for.
This video shows the results we got from using the highest viscosity oobleck.
1:2
5:1
3:1
Experiment Set-Up
Function Generator
Speaker
Oobleck