Recently, during a physics lesson at a high school in Yuncheng, Shanxi, a teacher conducted a unique experiment that demonstrated the wonders of sound vibrations. The experiment caused millet grains to move and form intricate patterns on a board, allowing students to experience the mesmerising effects of sound waves in action.

The teacher first evenly spread millet over a metal plate and then used a violin bow to rub against the plate, generating vibrations. These vibrations travelled across the plate, creating specific standing wave patterns. As a result, the millet grains rearranged themselves into various fascinating formations, influenced by the frequency and intensity of the vibrations.

This phenomenon was first discovered in the 18th century by German physicist Ernst Chladni. He used a violin bow to vibrate a metal plate covered with fine sand, observing how the sand formed distinct patterns. These formations later became known as Chladni figures.

Chladni figures not only illustrate the captivating effects of sound vibrations but also reveal fundamental principles of wave propagation in different media. By studying these patterns, scientists and students alike can gain deeper insights into the nature of sound and wave behaviour.