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# Wave Interactions - PowerPoint PPT Presentation

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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## PowerPoint Slideshow about ' Wave Interactions' - alize

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Presentation Transcript

### Wave Interactions

Reflection, Refraction, Diffraction, Interference and Resonance

• Wet a tennis ball and complete the following tests:

• Roll it perpendicular to the wall

• Roll it at an angle

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

Normal

Reflected

Wave

Incident

Wave

• The angle of incidence is equal to the angle of reflection

• All waves obey this law

• 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

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

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 Oddities how waves change direction

Cool Wave Oddities how waves change direction

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…