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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.

$1 - $5 per group Ages 11 - 18 10 to 30 minutes
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What happens when two wave pulses meet in the middle? Send waves down a spring to watch them travel and interact.

1 cent - $1 per student Ages 4 - 18 Under 5 minutes