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In this activity, learners investigate the sense of hearing and plan and conduct their own experiments.

This activity was designed for blind learners, but all types of learners can model how vibrating particles, such as in a sound wave, bump into other particles causing them to vibrate, and that the vib

This activity (8th activity on the page) tests learners' ability to identify things using only the sense of hearing.

See and hear how sound waves travel through different types of materials. Extend the experiment online and learn how you can "see" with sound waves using ultrasound.