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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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Presentation Transcript
wave interactions

Wave Interactions

Reflection, Refraction, Diffraction, Interference and Resonance

which way does a ball bounce
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
Reflection
  • Reflection happens when a wave hits a surface through which it cannot pass.
angles of incidence and reflection
Angles of Incidence and Reflection

Normal

Reflected

Wave

Incident

Wave

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

diffraction
Diffraction
  • When a wave moves around a barrier or through an opening, it bends and spreads out
cool wave oddities
Cool Wave Oddities
  • Interference: when waves meet and interact, interference occurs
  • There are two types of interference
    • Constructive
    • Destructive
cool wave oddities3
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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