Wave Interactions

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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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Presentation Transcript

### 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
• Reflection happens when a wave hits a surface through which it cannot pass.
Angles of Incidence and Reflection

Normal

Reflected

Wave

Incident

Wave

The Law of Reflection
• The angle of incidence is equal to the angle of reflection
• All waves obey this law
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
• When a wave moves around a barrier or through an opening, it bends and spreads out
Cool Wave Oddities
• Interference: when waves meet and interact, interference occurs
• There are two types of interference
• Constructive
• Destructive
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…