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WAVES

WAVES. Chapter 12 Physics. Waves transfer what?. ENERGY!!!!. What are the two main types of waves?. MECHANICAL WAVES ELECTROMAGNETIC WAVES. Which type of wave requires a medium?. MECHANICAL WAVES Electromagnetic waves do NOT need a medium. What are 3 examples of Mechanical Waves?.

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WAVES

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  1. WAVES Chapter 12 Physics

  2. Waves transfer what? ENERGY!!!!

  3. What are the two main types of waves? • MECHANICAL WAVES • ELECTROMAGNETIC WAVES

  4. Which type of wave requires a medium? MECHANICAL WAVES Electromagnetic waves do NOT need a medium.

  5. What are 3 examples of Mechanical Waves? • Water waves • Sound waves • Seismic waves

  6. Radio waves What are some examples ofElectromagnetic Waves?

  7. Microwaves

  8. Infrared light • Visible light • Ultraviolet light

  9. X-rays • Gamma Rays

  10. What are the colors of Visible Light? • ROYGBIV

  11. ROYGBIV • RED • ORANGE • YELLOW • GREEN • BLUE • INDIGO • VIOLET

  12. Which color is the HIGHEST energy wave? • VIOLET

  13. Which color is theLOWEST energy wave? • RED

  14. What 3 characteristics doAll Waves have? • Amplitude • Wavelength • Frequency

  15. What does the size of the amplitude of a wave tell us? • HIGH AMPLITUDE = HIGH AMOUNTS OF ENERGY • LOW AMPLITUDE = LOW AMOUNTS OF ENERGY

  16. What unit do we use to measure Wavelengths in? • Meters

  17. What greek letter do we useto represent a wavelength? • Lambda 

  18. What are the 3 units we can use for Frequency of a wave? • Waves / second • Cycles / second • 1/s = Hertz (Hz)

  19. Frequency Example Problem • A boy standing on a dock counts 20 waves • pass by in 5 seconds. What is the frequency • of the waves? f = #waves / time 20 waves / 5 seconds = 4 Hz

  20. Frequency Example Problem #2 • If the frequency of the waves is increased • to 8 Hz, how many waves will pass by the • boy in 2 seconds? f = #waves / time 8 Hz = #waves / 2 seconds 8 Hz x 2 seconds = 16 waves

  21. Name the 2 types of Mechanical waves. • TRANSVERSE WAVES • LONGITUDINAL WAVES

  22. Which type of wave form crests and troughs? • TRANSVERSE

  23. Longitudinal wave do not have crests and troughs, instead they have what? • COMPRESSIONS • RAREFACTIONS

  24. How does the medium movewhen a longitudinal wave moves through it? • The medium vibrates horizontally.

  25. Surface Waves move both horizontally and vertically simultaneously, which produces what kind of movement? • Circular

  26. Speed of WavesWhat is the wave equation? • V = f  • speed = frequency times wavelength

  27. SPEED OF WAVESspeed = frequency x wavelength v = f x λ Example #1 A wave on a lake is traveling with a velocity of 8 m/s. the frequency is 2 Hz. What is the wavelength of this wave? 8 m/s = 2 Hz xλ λ = 4 m Speed of a wave example http://www.acoustics.salford.ac.uk/schools/teacher/lesson1/lesson1interactive.html

  28. Name the 4 ways waves interact. • Reflection • Refraction • Diffraction • Interference

  29. Explain reflection of a wave. • Bouncing back of a wave after it strikes a boundary.

  30. Explain Refraction. • The change in path of a wave when it moves into a medium of a different density.

  31. REFRACTIONBending of waves due to a change in speed.Short tutorial/animation to watch.http://www.wiley.com/college/strahler/0471480533/animations/ch19_animations/animation2.html

  32. Explain Diffraction. • The curving of waves around barriers and ability of waves to spread out in circular pattern after passing through a narrow opening. See picture below.

  33. 3. DIFFRACTIONBending of waves around the edge of an obstacle.

  34. What are the 2 types of Interference? • Constructive • Destructive

  35. Which of the pictures below is an example of Constructive Interference? The picture on the left is constructive interference. The picture on the right is destructive interference.

  36. 4. INTERFERENCE1.   CONSTRUCTIVE INTERFERENCEWhen waves combine and produce a wave that is greater than either of the waves alone.

  37. 2.   DESTRUCTIVE INTERFERENCEWhen waves combine and produce a wave that is less than either wave alone.

  38. Applet Interference by 3 wavessimultaneously. Constructive interference applet http://id.mind.net/~zona/mstm/physics/waves/interference/waveInterference1/WaveInterference1.html Both Constructive/Destructive interference applet http://id.mind.net/~zona/mstm/physics/waves/interference/waveInterference2/WaveInterference2.html

  39. Nodes and Antinodes are parts of what kind of wave? • Standing Wave

  40. NODESStationary points of a standing wave.ANTINODESLoops of a standing wave where maximum oscillation of the medium occurs.

  41. The frequency at which a standing wave occurs is called what? • Resonant Frequency • Sometimes called Natural Frequency.

  42. STANDING WAVESRESONANT FREQUENCY(or natural frequency)The frequency at which a standing wave occurs.

  43. The End!.

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