Acoustic standing wave

This exhibit allows participants to truly understand the principle of sound standing waves through interactive experiences. The exhibit is composed of a platform, a glass tube with foam beads and a sound control device. Participants can change the frequency of sound emitted by speakers by pressing buttons corresponding to three frequencies: high, medium and low; The incident sound wave propagates in the acrylic tube and generates the reflected wave. When the reflected wave and the incident sound wave meet the specific conditions to form a standing wave, the phenomenon that the foam ball in the tube vibrates with the standing wave can be seen visually. one Step into the exhibit, press the exhibit start button, and activate the interactive device 2 Press the buttons on the sound control device for different audio frequencies, high, medium, and low, to change the sound frequency by 3 Observe the specific situation of foam balls vibrating with standing wave in the acrylic tube • Principle of standing wave visualization: foam balls in the acrylic tube will follow the vibration at the vibration belly point (the strongest vibration area) of the standing wave, and will be relatively static at the node (the weakest vibration area), which can be visualized through the vibration state of the balls.

The unit is designed for unsupervised public use: controls are recessed or shielded, moving parts are enclosed, and the interface is operable by a child of about six with no instruction. Where a screen is used, the language can be switched without changing the hardware, and the content can be replaced on site.