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In this activity (described on pages 39-42 of PDF), learners make a paper wheel (on pages 57-60 of PDF) that shows them the relative loudness of different sounds.

In this activity (on pages 25-32 of PDF), learners make models of the inner ear out of pipe cleaners.

What happens when two wave pulses meet in the middle? Send waves down a spring to watch them travel and interact.

In this activity (last activity on the page), learners make a model of the eardrum (also called the "tympanic membrane") and see how sound travels through the air.

In this activity, learners turn an ordinary metal coat-hanger into a (very quiet) musical instrument.

Do you have an extra portable cassette tape player hanging around?