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Music, Math, and Motion with Dr. E.J. Zita & Dr. Arun Chandra The Evergreen St. College

Music, Math, and Motion with Dr. E.J. Zita & Dr. Arun Chandra The Evergreen St. College. Winter week 2 Tuesday 13 Jan.2009. Physics of Sound Overview. What is sound? Waves: simple harmonic motion Representing sound waves mathematically Sources of sound Wavelength and frequency

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Music, Math, and Motion with Dr. E.J. Zita & Dr. Arun Chandra The Evergreen St. College

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  1. Music, Math, and Motionwith Dr. E.J. Zita & Dr. Arun ChandraThe Evergreen St. College Winter week 2 Tuesday 13 Jan.2009

  2. Physics of Sound Overview • What is sound? • Waves: simple harmonic motion • Representing sound waves mathematically • Sources of sound • Wavelength and frequency • Speeds of sounds and sources • Perception of sound • Resonance • Applications • Sound waves in nature

  3. What is sound? Sound waves: Compressions and expansions of a medium such as air

  4. Waves & simple harmonic motion

  5. Representing sound mathematically s

  6. Sources of Sound Strings Open pipes Closed pipes

  7. Wavelength and frequency Wavelength l space Period T time

  8. Speeds of sounds and sources

  9. Perception of sound Intensity = Power / Area

  10. Resonance: an object oscillates at the same frequency as the driving source http://www.youtube.com/watch?v=j-zczJXSxnw http://www.labinalorry.co.uk

  11. Harmonics Females typically beat wings 400 times per second Males typically beat wings 600 times per second What harmonic of both frequencies matches? 1200 Hz = 3*400 = 2*600 http://abcnews.go.com/Technology/wireStory?id=6604532 http://academic.evergreen.edu/curricular/mmm/documents/SoundScience/MosquitoesMatcWingbeats.pdf

  12. Applications • Doppler effect • Beats • Sonic boom • Ultrasound • Interference

  13. Sound waves in nature • Big Bang • Pulsating stars • Planets’ atmospheres • Insects & Trees • Whales drink sounds • Sand dunes • Chimps • … more …

  14. Whales drink sounds http://academic.evergreen.edu/curricular/mmm/documents/SoundScience/WhalesDrinkSounds.pdf

  15. Ultrasound from pine bark beetles & dying trees http://academic.evergreen.edu/curricular/mmm/documents/SoundScience/PopChirpFigs.pdf

  16. Goals and activities

  17. Physics of Sound syllabus Thursday 3:00-5:00: Physics Help Session in CAL Friday 1:00-5:00: Physics of Sound in CAL (Lab II)

  18. Week 2 overview http://academic.evergreen.edu/curricular/mmm/#syl

  19. Coming up next: Seminar onKuhn (first half) and Brün (paradigms) Do you have questions of FACT about scientific examples in Kuhn? If so, let’s spend a short time answering them before seminar.

  20. Seminar groups

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