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Ch 12.2 Waves in Motion ppt

Types of waves
Types of wave interactions

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Ch 12.2 Waves in Motion ppt

  1. 1. Integrated Science Unit 4, Chapter 12
  2. 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. 3. Longitudinal WaveThe 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. 4. Transverse WavesThe difference between the two types: 5
  5. 5. 12.1 Frequency, Amplitude and Wavelength
  6. 6. 12.2 Graphs of Harmonic MotionKey Question:How do waves move and interact with things?
  7. 7. *Wave Shapes *PlaneWaves- a wave that has crests all in a straight line.
  8. 8. *Wave Shapes *CircularWaves- a wave that has circular wave fronts that move outward from the center.
  9. 9. Plane Waves
  10. 10. Circular Waves
  11. 11. *What happens when a wave hits anobstacle? *Reflection *Refraction *Diffraction *Absorption
  12. 12. REFLECTION
  13. 13. REFRACTION
  15. 15. ABSORPTION
  16. 16. Wave InteractionAll 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. 17. Constructive InterferenceLet’s consider two waves moving towards each other, both having a positive upward amplitude.What will happen when they meet? 22
  18. 18. *Constructive Interference*They will ADD together to produce a greater amplitude.This is known as CONSTRUCTIVE INTERFERENCE. 23
  19. 19. Destructive InterferenceNow 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. 20. *Destructive Interference*This time when they add together they will produce a smaller amplitude.This is know as DESTRUCTIVE INTERFERENCE. 25
  21. 21. Wave Interference 26
  22. 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. 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