This unit finishes with a lab where students actually measure waves they make with Slinkys.
Sound is a hard concept to understand, but using Slinkys are a great way to model sound waves.
The manipulative is a great way for students to quickly find the correct formula for wave speed, frequency, and wavelength.
To finish the lab I have a video based test off the MythBusters, from their "Brown Note" episode. You can use this test as a pre or post unit assessment.
KeyWords: Mythbusters, brown Note, sound, Slinkys, wave speed, frequency, wavelength, lab