To model for students who are blind or visually impaired how vibrating particles, such as in a sound wave, bump into other particles causing them to vibrate and that the vibrations travel; to demonstrate the chain reaction of sound waves, using old video cassettes
Frequency is the number of complete waves passing a given point in a given time. Wave models show the crests of the wave closer together to indicate higher frequency, and movement of the waves to show the traveling of the vibrations. Phenomenon such as the vibration of particles is frequently modeled using diagrams or pictures.
This activity provides an auditory and tactile experience to model something that no one can actually see. Many people use a row of dominos to show the passage of the vibrations. However, it is difficult to set up the small dominoes without knocking over the adjacent ones.