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This activity (on page 2 of the PDF under SciGirls Activity: Extreme Sounds) is a full inquiry investigation into sound.

Over $20 per group Ages 8 - 14 2 to 4 hours
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This activity (on page 2 of the PDF under SciGirls Activity: Music and Sound) is a full inquiry investigation into sound frequency.

$5 - $10 per group Ages 8 - 14 1 to 2 hours
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Sound changes pitch relative to how you or the source of the sound is moving. Use this simple activity developed by the Exploratorium to experience the Doppler Effect yourself!

1 cent - $1 per student Ages 6 - 14 Under 5 minutes