FrequencyVolume
Hz
cm3
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

Coke Bottle Resonance

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.

Change to plot vs 1/sqrt(V)Plastic coke bottle frequencies
Glass coke bottles of different size
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Wave concepts

Resonance concepts
 
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Coke Bottle Resonance

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.


C* = constant for this experiment.
FrequencyVolume
Hz
cm3
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.

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.

Change to linear plot
Index

Wave concepts

Resonance concepts
 
HyperPhysics***** Sound R Nave
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