Making sound visible is a useful activity in teaching students the concepts that sound is caused by vibrating objects and that different sounds are caused by different types of vibration. This particular activity makes it possible to see the sounds produced by observing a vibrating, metal plate. As the plate produces sound it vibrates violently in some areas and not at all in other regions. If a small amount of very fine sand or poppy seed is sprinkled on the plate as it vibrates, the seeds will move to areas where vibration is minimal and form distinct distributional patterns on the surface of the plate. The patterns thus formed are called Chladni figures after their discoverer, Ernst Chladni.
Iowa Science Teachers Journal
© Copyright 1975 by the Iowa Academy of Science
Iowa Science Teachers Journal: Vol. 12
, Article 9.
Available at: https://scholarworks.uni.edu/istj/vol12/iss3/9