Interference with Resonance Boxes

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Interference with Resonance Boxes

2 resonant boxes with different tuning forks on top

PIRA 3B50.60

The depth of the cavity in the resonance box shown at right is equal to one-quarter of the wavelength of the sound produced by the tuning fork. After striking the tuning fork with a rubber or padded mallet, walk towards and away from a good reflective surface for sound, like a blackboard. Constructive and destructive interference between the sound produced by the fork and the reflected sound can be easily heard.