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Sound can travel through a variety of media.

Create an instrument that you don't play--you just listen to it through tubes of various lengths.

We listen to stereo music systems, tv's, and radios because it simulates being where the sound originates.

In this group activity, learners see and hear the speed of sound. A learner designated the "gonger" hits a gong, once every second, as the rest of the group watches and listens from a distance.

In this activity, learners use a compact disc to make a spectrometer, an instrument used to measure properties of light.