1. Soundwave Interaction: The speaker emits sound waves that interact with the water in the glass. These sound waves cause the water particles to vibrate and create ripples on the water's surface.
2. Resonance: The vibrations caused by the sound waves can reach a point of resonance, where the frequency of the sound waves matches the natural frequency of vibration for the water in the glass. This resonance amplifies the water's vibrations, causing the water to slosh and splash more vigorously.
3. Acoustic Standing Waves: The interaction between the sound waves and the water's surface creates acoustic standing waves. These are stationary waves that form when sound waves are reflected back and forth between two surfaces, in this case, the water's surface and the bottom of the glass.
4. Capillary Waves: The vibrations in the water also generate capillary waves, which are small ripples or waves that form on the surface of a liquid due to surface tension. These waves add to the overall disturbance on the water's surface.
As a result of these physical interactions, the glass of water placed on the stereo speaker starts to vibrate vigorously, causing the water to slosh and splash over the edges of the glass. The combination of sound waves, resonance, standing waves, and capillary waves creates a dynamic and visually appealing effect.