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- Students are asked to line up at the front of the classroom and represent particles being displaced in a periodic system with repeat distance $a$.
- The instructor will represent a point in the envelope function of constant amplitude; as the instructor walks in front of the particles, each student particle will oscillate up and down to create an envelope function.
- The same process is repeated with several different wavelengths for the envelope function.
- After the first group acts out an envelope function, the class can be asked:

SWBQ: If I was moving at velocity $\frac{a}{1 \sec}$, what is the frequency at which the particles bounced up and down?