Coke Bottle Resonance
科克瓶共振
The cavity resonance frequencies of a 0.5 liter glass coke bottle were recorded by blowing over the top of it and measuring the frequency using a microphone and a digital frequency counter.
用嘴对着0.5升玻璃汽水瓶的顶部吹气，并利用麦克风和数字频率计测量其腔体共振频率。
C* = constant for this experiment.
C * = 本实验中的常数。 |
| Frequency
频率 | Volume
体积 |
| Hz
赫兹 | cm3
立方厘米 |
| 355 | 100 |
| 310 | 125 |
| 280 | 150 |
| 256 | 175 |
| 239 | 200 |
| 225 | 225 |
| 212 | 250 |
| 202 | 275 |
| 193 | 300 |
| 185 | 325 |
| 178 | 350 |
| 171 | 375 |
| 165 | 400 |
| 161 | 425 |
| 156 | 450 |
| 152 | 475 |
| 146 | 500 |
| When the resonant frequency is plotted as a function of the inverse square root of the volume, a straight line plot is obtained. This shows that the frequency is proportional to the inverse square root of volume. 
当共振频率作为体积倒平方根的函数进行绘制时，得到的是直线图。这表明频率与体积的倒平方根成正比。 |
The calculated frequency of a resonant cavity depends upon the speed of sound v. It also depends upon the square roots of three physical parameters: the area of the opening A, the volume of the cavity V, and the length of the opening port L. The quantity C* indicated in the top graph includes the factors other than the volume which are held constant for these measurements.
共振腔的计算频率取决于声速v。它还取决于三个物理参数的平方根：开口面积A、腔体体积V和开口通路的长度L。顶部图中所示的量C*包括了这些测量中保持不变的其他因素。 |
