Abstract
Wave physics is a fundamental scientific concept with broad applications across diverse disciplines, from wireless communications and acoustic engineering to the musical arts. Despite its ubiquitous presence in our daily lives, teaching wave phenomena—particularly to non-science majors—poses significant pedagogical challenges. The inherent invisibility of most waves, coupled with the reliance on complex mathematical calculations and abstract technical terminology, often hinders students’ intuitive understanding. Furthermore, commercially available demonstration kits primarily focus on visible optics, leaving a gap in tools that demonstrate highly relatable, everyday phenomena like sound waves.
To address these challenges, this project introduces customised, hands-on experimental educational tools designed to enhance the experiential learning of wave physics. Our primary objective is to bridge the gap between textbook knowledge and real-world applications by translating abstract principles into directly observable phenomena.
In this project, we have developed four novel demonstration setups: sound wave interference, Doppler effect, acoustic levitation, and visualisation of standing waves in a string. The sound wave interference kit utilises paired loudspeakers to allow students to explore physical acoustic properties by mapping loud and silent regions using their ears and/or mobile devices. The Doppler effect setup uses a motor to rotate a sound source, demonstrating the frequency shifts characteristic of this phenomenon. The acoustic levitation system visualises standing waves in a closed-ended tube by trapping lightweight Styrofoam beads at the wave antinodes, providing a striking visual representation of acoustic pressure. Finally, the setup for the visualisation of standing waves in a string consists of a vibrating string and stroboscopic LED flashlights. By synchronising the flashing frequency of the LEDs with the vibration frequency of the string, the waveform of the standing waves becomes clearly visible to the students.
These tools have been deployed across various interdisciplinary undergraduate courses, including fundamental physics courses and a Common Core course exploring the science of music. Additionally, the project actively promotes undergraduate research by inviting four undergraduate students to participate as student research assistants in the design, testing, and construction of these demonstration kits.
By integrating these interactive, real-life demonstrations into lectures and tutorials, we anticipate a significant improvement in students’ visual understanding of wave physics. Students will gain hands-on experience and develop a deeper, intuitive grasp of complex physics terminology. This experiential approach will not only enrich our university’s science curriculum but also serve as a reproducible model for broader pedagogical use.