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Please be Seated

Join us in this interactive PowerPoint program designed for pre-college students. Learn about the properties of waves, including transverse and longitudinal waves, the speed of light and sound, the Sonic spectrum, wave superposition, Huygens' principle, the Doppler effect, diffraction, interference, reflection, and refraction. Explore real-life examples such as sound barriers and mirages. Don't miss out on this educational experience!

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Please be Seated

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Presentation Transcript

  1. PleasebeSeated

  2. Making Waves Physics is Phun January 2007

  3. View this PowerPoint program Programs for Pre-College Students

  4. Bell in Vacuum Experiment

  5. Transverse Waves

  6. c = fl c = speed of light f =frequency l = wavelength

  7. Speed of Light(in a vacuum) c = 300,000,000 m/s = 3 x 108 m/s

  8. Longitudinal Waves

  9. s = fl s = speed of sound f =frequency l = wavelength

  10. Speed of Sound s = 331.45 m/s ~1087 ft/s at 0o C s = depends on temperature but not on pressure

  11. The “Sonic” SpectrumInfrasound: < 20 HzSound:20 Hz – 20,000 Hz (20kHz)Ultrasound: > 20 kHz (~1013 Hz maximum)

  12. Light waves: 1. are transverse waves. 2. do not require a medium. Sound waves: 1. are longitudinal waves. 2. require a medium.

  13. Wave Properties I • Superposition • Hugygens’ Principle • Doppler Effect

  14. Superposition

  15. Huygens’ Principle

  16. Doppler Effect • Sound Doppler Ball Moving Cars, etc. • Light Spectra of stars

  17. Fraunhofer Spectrum

  18. Wave Properties II • Diffraction • Interference • Reflection • Refraction

  19. Diffraction Waves spread out and bend around corners within the same medium.

  20. Highway Sound Barrier Photograph courtesy of Enterprise Flasher Company

  21. Interference Two-source interference pattern Moire figure model

  22. Bose QuietComfort 2 Noise Cancelling Headphones

  23. Light examples

  24. “Iridescence”of peacock feather

  25. Reflection

  26. Refraction Waves bend due to variation of medium.

  27. Waves at the Beach

  28. Mirage Formation

  29. Water Mirage

  30. Desert Lake

  31. Mirage Compliments of Robert Greenler

  32. Sunrise over the Ocean

  33. The EndSee you next time! We are on the web at http://www.physics.umd.edu/lecdem/ Animated Gifs compliments of bellsnwhistles.com

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