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Types of waves

Types of wave interactions

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- 1. Integrated Science Unit 4, Chapter 12
- 2. 12.1 Two Types of Waves:A transverse wave has its oscillations perpendicular to the direction the wave moves.A longitudinal wave has its oscillations in the same direction as the wave moves.
- 3. Longitudinal WaveThe wave we see here is a longitudinal wave.The medium particles vibrate parallel to the motion of the pulse.This is the same type of wave that we use to transfer sound. show tuning fork demo 4
- 4. Transverse WavesThe difference between the two types: 5
- 5. 12.1 Frequency, Amplitude and Wavelength
- 6. 12.2 Graphs of Harmonic MotionKey Question:How do waves move and interact with things?
- 7. *Wave Shapes *PlaneWaves- a wave that has crests all in a straight line.
- 8. *Wave Shapes *CircularWaves- a wave that has circular wave fronts that move outward from the center.
- 9. Plane Waves
- 10. Circular Waves
- 11. *What happens when a wave hits anobstacle? *Reflection *Refraction *Diffraction *Absorption
- 12. REFLECTION
- 13. REFRACTION
- 14. DIFFRACTION
- 15. ABSORPTION
- 16. Wave InteractionAll we have left to discover is how waves interact with each other.*When two waves meet while traveling along the same medium it is called INTERFERENCE. 21
- 17. Constructive InterferenceLet’s consider two waves moving towards each other, both having a positive upward amplitude.What will happen when they meet? 22
- 18. *Constructive Interference*They will ADD together to produce a greater amplitude.This is known as CONSTRUCTIVE INTERFERENCE. 23
- 19. Destructive InterferenceNow let’s consider the opposite, two waves moving towards each other, one having a positive (upward) and one a negative (downward) amplitude.What will happen when they meet? 24
- 20. *Destructive Interference*This time when they add together they will produce a smaller amplitude.This is know as DESTRUCTIVE INTERFERENCE. 25
- 21. Wave Interference 26
- 22. Check Your Understanding Which points will produce constructive interference and which will produce destructive interference? Constructive G, J, M, N Destructive H, I, K, L, O 27
- 23. Your Turn: Create a graphic organizer using the following terms:1. Reflection2. Refraction3. Diffraction4. Absorption Explain what the term means. (use your own words) Draw a picture to represent what happens. List Examples

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