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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 how waves change direction

  • Interference: when waves meet and interact, interference occurs

  • There are two types of interference

    • Constructive

    • Destructive


Cool wave oddities1
Cool Wave Oddities how waves change direction


Cool wave oddities2
Cool Wave Oddities how waves change direction


Cool wave oddities3
Cool Wave Oddities how waves change direction

  • 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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