Stretch the spring to about 6 to 10 times its compressed size, with one student holding each end. The holder should hold the spring still, while the operator moves the spring as directed. To create a P wave, the operator pushes the spring directly toward the holder. To create an S wave, the operator waves the spring from side to side. To create an L wave, the operator lifts the spring up and snaps it down.
Students can observe that the L wave is the biggest of the three.
Back to Top Rather than have students work independently, set up the experiment for them and demonstrate the different kinds of waves. Invite volunteers to try using the mallet themselves. Back to Top 1. Imagine you are making a movie about tsunamis. Explain how you would show the effects of a tsunami without putting anyone in danger.