Today I modeled with a slinky what compression and rarefaction looks like. I also compared the similarities with a slinky and a sound wave. I also asked students to stand up and show me what compressed sound waves look like and I did the same with rarefaction. This website has an illustration and describes compression and rarefaction in more detail.
http://everythingscience.co.za/grade-10/09-longitudinal-waves/09-longitudinal-waves-02.cnxmlplus
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