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Do : Pushed and pulled on a slinky.

Interactive Notes: Sound . Do : Pushed and pulled on a slinky. See : As the energy moved through, it squeezed and compressed the bands. What ’ s Happening: Sound waves are very fast ripples of energy that squeeze matter without moving it. They are appropriately named compression waves.

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Do : Pushed and pulled on a slinky.

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  1. Interactive Notes: Sound Do: Pushed and pulled on a slinky. See: As the energy moved through, it squeezed and compressed the bands. What’s Happening: Sound waves are very fast ripples of energy that squeeze matter without moving it. They are appropriately named compression waves. Read p. ¶ together

  2. Do: Tapped on a metal hanger by itself, and then on a foam block. • See: The foam amplified it, and made it sound like a church bell! • What’s Happening: The foam has more surface area, so more air touches it. And since air conducts sound, it can conduct more sound. The best conductors of sound are: • 1. solid (best) • 2. liquid • 3. gas (worst) Read p. ¶ together

  3. Do: Shook water inside a flask with and without air. See: Without air there was no sound. What’s Happening: Sound cannot travel through empty space because it must have something to compress to be able to travel. So, does an exploding star make a sound? Does light travel through empty space?

  4. Do: Struck a small and a large tuning fork. See: The smaller fork was higher pitched. What’s Happening:Pitch is the highness or lowness of a sound. Frequency is how many waves pass a point per second. The more waves, the _____ the pitch, and fewer waves= ____ pitch. 1000 Hz higher lower 125 Hz- means 125 waves pass by your ear every second

  5. Clean Up • Person 1 • Put Slinky in bag • Person 2 • Count 4 new note sheets • Person 3 • Put your flask on teacher’s desk. • Get a new flask • Person 4 • Final check- does you box look like this?

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