Fig. 7
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(Top) Theoretical frequency of the sound plotted against the experimental main sound frequency. A wide range of balloon radius (3–15 cm) and different nuts/coins (see legend) were studied. Frequencies ranging from 100 Hz to little less than 2000 Hz were reached. The theoretical prediction is plotted as a black line. (Bottom) Lowest vibrational frequency of the balloon membrane plotted as a function of 1∕R. A wide range of balloon radius (3–15 cm) and different nuts/coins (see legend) were studied. Frequencies from 100 Hz to 200 Hz were reached.
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