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# Wave Interactions

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### Wave Interactions

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