{"id":65138,"date":"2026-07-05T05:31:14","date_gmt":"2026-07-04T20:31:14","guid":{"rendered":"https:\/\/phys-edu.net\/wp\/?p=65138"},"modified":"2026-07-05T05:31:14","modified_gmt":"2026-07-04T20:31:14","slug":"from-bucket-to-science-lab-measuring-sound-wavelengths-with-your-smartphone-air-column-resonance-experiment","status":"publish","type":"post","link":"https:\/\/phys-edu.net\/wp\/?p=65138&lang=en","title":{"rendered":"From Bucket to Science Lab! Measuring Sound Wavelengths with Your Smartphone (Air Column Resonance Experiment)"},"content":{"rendered":"

I’m Ken Kuwako, a science educator. Every day is an experiment.<\/strong><\/span><\/p>\n

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In this article, I’ll introduce a simple but powerful experiment that explores sound resonance using the iPhone app “A\u0192G \u2013 Audio Function Generator<\/a>.” Students can actually experience the relationship between wavelength and frequency, then confirm it with calculations. Best of all, the equipment is inexpensive and easy to find, making this an experiment you can bring straight into tomorrow’s classroom.<\/p>\n

Measuring Sound Wavelength with Resonance<\/h3>\n

This experiment takes advantage of resonance\u2014the phenomenon where sound suddenly becomes much louder under specific conditions. Resonance is one of the most important concepts in wave physics. By creating resonance inside an acrylic tube placed in water, you can visualize sound waves, measure their wavelength, and calculate their frequency.<\/p>\n

Materials<\/h4>\n
    \n
  • Acrylic tube<\/b>: About 50 cm (20 in) long is ideal. Tubes are available at most hardware stores for around \u00a5800. A narrower inner diameter produces clearer resonance.<\/li>\n
  • iPhone<\/b>: With the “A\u0192G \u2013 Audio Function Generator” app installed. One phone per group is plenty. Having students install the app beforehand makes the activity run much more smoothly.<\/li>\n
  • Water tank<\/b>: Deep enough to stand the acrylic tube upright while keeping it submerged.<\/li>\n
  • Stickers<\/b> or a permanent marker<\/b>: For marking resonance points. A measuring tape attached to the tube makes measurements even more accurate.<\/li>\n<\/ul>\n

    Procedure<\/h4>\n

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