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# Wave Interactions

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### Transcript

• 1. Wave Interactions
Students will be able to
Describe reflection, refraction, and diffraction
Explain interference and standing waves
Identify Seismic Waves
Find epicenter of earthquake using seismograph
Page 17
• 2. Reflection
When an object hits a surface through which it can not pass, it bounces back.
18
• 3. Reflection
Angle of incidence = Angle of reflection
18
• 4. Refraction
Bending of waves
When a wave enters a new medium its speed changes.
19
• 5. Diffraction
When a wave moves around a barrier or through an opening, it bends and spreads out.
20
• 6. Interference
What happens when two waves meet.
Constructive = Working together
Destructive = Subtracting from each other
20
• 7. Interference
21
• 8. Standing Waves
If the incoming wave and the reflected way have the correct frequency, they produce a combined wave that appears to be standing still
Node = zero amplitude
Antinode = maximum amplitude
22
• 9. Standing Waves
22
• 10. Resonance
Most objects have a natural frequency of vibration
Resonance
Increase amplitude occurs when external vibrations match the objects natural frequency
Music
Stronger, clearer sounds
23
• 11. Resonance
23