Physics Central
Physics Central: Physics at Your Desk: Drumming Fingers
An easy experiment through which students explore sound waves while tapping their fingers on a desk or table in a quiet room.
The Franklin Institute
Franklin Institute: The Science of Sound
This Franklin Institute webpage provides an introduction to understanding sound waves based on 5th grade science lessons.
Middle School Science
Middle School Science: Tuning Fork Lab
In this succinct lesson plan, students will compare the sounds produced by tuning forks and observe the behavior of sound waves in different media.