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Exploring Waves and Sound

Learn about transverse and longitudinal waves, how they move on a spring, and the properties of sound waves. Understand frequency, intensity, and the relationship between amplitude and energy.

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Exploring Waves and Sound

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  1. Seats: period3

  2. Seats: period8

  3. Seats: period10

  4. Popcorn & Movie tuesday after school Brain Games

  5. Catalyst 4 minutes! • Draw how transversewaves move on the spring. Dibujacomoondastransversalesmueven en el resorte. • Explain how the ribbon will move when a transversewave is sent along the spring. Explicacomo la cintamoveracuando se mandaunaondastransversalesatraves del resorte. • Draw how longitudinal waves move on the spring. Dibujacomoondaslongitudinalesmuevenen el resorte. • Explain how the ribbon will move when a longitudinal waveis sent along the spring. Explicacomo la cintamoveracuando se mandaunaondaslongitudinalesatravesdel resorte. ribbon

  6. 80% party! 3 10

  7. Popcorn & Movie tuesday after school Brain Games

  8. 100.Benjamins love it or hate it! hot seat ! head phones ! hot seat ! music ! hot seat ! head phones ! head phones !

  9. 100.Benjamins • 1: Raise a hand • 1: Exemplary answer • 1: Demonstrate North Star traits • Problem solver • Goal driven • 3: 100% seated before the bell • 3: “Ready for your attention” • 3: Lab / activity clean up • 5: 100% on task during practice • 5: 80% exit ticket average Headphones on Friday!

  10. Assignment #21due WEDNESDAY! unit 6:waves

  11. Objectives Agenda -Catalyst 6 -Wave Intro 16 -Practice 14 -Test Score Wars 14 • Agenda • Catalyst 5 • Video clip 5 • Sound wave intro 5 • Medium (Phet) 10 • Pitch & intensity (Phet) 10 • Mini poster 15 • We are learning about… • longitudinal wave properties • We will be successful when we can… • differentiate between transverse andlongitudinal waves Surfing in Sligo, Ireland

  12. Compare T vs. L A crest on a transverse wave is comparable to what part of a longitudinal wave? A trough on a transverse wave is comparable to what part of a longitudinal wave? Contrast transverse and longitudinal waves.

  13. Mythbusters: breaking glass

  14. SOUND is a Mechanical Wave Since a sound wave is a disturbance that travels through a mediumvia particle-to-particle interaction, a sound wave is characterized as a mechanical wave. spoon demo outer space

  15. Phet

  16. SOUND is a Longitudinal Wave longitudinal Sound waves are longitudinal waves because particles of the mediumvibrate parallelto the direction that the sound wave moves.  wave motion particle motion

  17. SOUND is a Pressue Wave Because of the longitudinal motion of the air particles in a sound wave, there are spaces in the air where the air particles are compressed together and other regions where the air particles are spread apart. These regions are known ascompressions and rarefactions. The compressions are regions of high air pressure while the rarefactions are regions of low air pressure. 

  18. Quick Check! A sound wave is a pressure wavewith compressionsand rarefactions. These compressions and rarefactions result because sound: • is more dense than air and thus has more inertia, causing the bunching up of sound. • waves have a speed that is dependent only upon the properties of the medium. • is like all waves; it is able to bend into the regions of space behind obstacles. • is able to reflect off fixed ends and interfere with incident waves • vibrates longitudinally; the longitudinal movement of air produces pressure fluctuations.

  19. Pitch & Frequency The frequency of a wave is measured as the number of vibrations of a particle of the medium per unit of time. If a particle of air vibrates 1000times in 2 seconds, then the frequencyof the wave would be 500 vibrations per second. A commonly used unit for frequency is the Hertz(Hz), where 1 Hertz = 1 vibration/second

  20. Hearing The human ear is capable of detecting sound waves with a wide range of frequencies, ranging between approximately 20 Hz to 20 000 Hz. • Dogscan detect frequencies as low as approximately 50 Hz and as high as 45 000 Hz. • Catscan detect frequencies as low as approximately 45 Hz and as high as 85 000 Hz. • Bats, being nocturnal creature, must rely on sound echolocation for navigation and hunting. Bats can detect frequencies as high as 120 000 Hz. • Dolphinscan detect frequencies as high as 200 000 Hz. • Elephants can detect infrasound, having an audible range from approximately 5 Hz to approximately 10 000 Hz.

  21. Intensity & Amplitude If more energy is applied to the string, then the string vibrates with a greater amplitude. The greater amplitudeof vibration of the guitar string sends more energy to the medium, causing air particles to move more.

  22. Phet

  23. Turn it in  homework due YESTERDAY!

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