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Wave Interactions

Wave Interactions. Reflection, Refraction, Diffraction, Interference and Resonance. Which way does a ball bounce?. Wet a tennis ball and complete the following tests: Roll it perpendicular to the wall Roll it at an angle. Reflection.

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Wave Interactions

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  1. Wave Interactions Reflection, Refraction, Diffraction, Interference and Resonance

  2. Which way does a ball bounce? • Wet a tennis ball and complete the following tests: • Roll it perpendicular to the wall • Roll it at an angle

  3. Reflection • Reflection happens when a wave hits a surface through which it cannot pass.

  4. Angles of Incidence and Reflection Normal Reflected Wave Incident Wave

  5. The Law of Reflection • The angle of incidence is equal to the angle of reflection • All waves obey this law

  6. Refraction • When waves enter a new medium, the waves change speed • When (and only when) the wave enters at an angle, refraction occurs • Part of the wave changes speed first • Wave becomes bent Air Water

  7. REFRACTION

  8. Refraction

  9. Diffraction • When a wave moves around a barrier or through an opening, it bends and spreads out

  10. These three (reflection, refraction, and diffraction) are how waves change direction

  11. Cool Wave Oddities • Interference: when waves meet and interact, interference occurs • There are two types of interference • Constructive • Destructive

  12. Cool Wave Oddities

  13. Cool Wave Oddities

  14. Cool Wave Oddities • Resonance: all objects have a natural frequency, and when force is applied at this particular frequency, constructive interference occurs • The amplitude of the vibration is continually reinforced until… • Catastrophe! • Or sometimes something useful happens… • http://www.youtube.com/watch?v=Qf0t4qIVWF4 plate • https://www.youtube.com/watch?v=LV_UuzEznHs vibration table • http://www.youtube.com/watch?v=cPALfz-6pnQ wine glass

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