1 neck …
Any science student should be acquainted with the Helmholtz resonator. The first example that will probably come to mind is the glass bottle: an enclosed volume that communicates with the outside world through a narrow neck.
But what if the volume opens to the outside air through several openings? Read on to know how to calculate the resonance frequency of such a resonator.
2 necks, 3 necks, many necks…
Langfeldt to the rescue: he put together a set of practical formulas to determine the resonance frequency of a multi-neck Helmholtz resonator. Fill in the yellow boxes to obtain the frequency in the red cell: