Abstract
This paper describes a redesigned air-column resonance apparatus1 that offers several advantages over the traditional one.2 It does away with water or the long rod to vary the length of the air column. Instead a specially designed piston is moved inside a plastic or glass tube by external magnets to vary the length of the air column. Plastic tubes of various sizes are commercially available,3 but we salvaged one from an old commercial resonance apparatus. The tube has 2.85-cm inner and 3.15-cm outer diameter, respectively. The redesigned resonance apparatus can be operated in either the horizontal or the vertical position.
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