<![CDATA[Smartphone-based experiments can link everyday phenomena to quantitative representations, yet bottle-and-smartphone Helmholtz resonance is already documented, and evidence on how such a design can be made usable in grade XI physics is limited. This study presents the design of a smartphone-assisted Helmholtz resonance kit for sound waves, comprising a bottle specification, setup guide, prediction-observation-explanation worksheet, spectrum guide, and theoretical simulation, together with an evaluation plan. The design follows the analysis and design stages of ADDIE through document analysis; physical assembly, expert assessment, and student trials have not been conducted. Assuming a 10 mm neck radius, 50 mm neck length, 343 m/s sound speed, and total end correction of 1.4 times the radius, air volumes of 150-500 mL yield predicted frequencies of approximately 312-171 Hz. A first-order uncertainty analysis shows that, with an assumed 0.5 mm uncertainty in neck radius, geometry contributes about 4.5% to the frequency, exceeding the nominal FFT bin spacing of 2.69 Hz. These are simulated values, not measurements. The contribution is a design and an uncertainty-aware measurement plan; technical accuracy, educational validity, and learning effectiveness require further testing.]]>
Copyrights © 2025
