1. Wave Basics – Day 1

2. Fill in the blank: Waves transmit ________. energy

3. What is a wave? Disturbance that carries energy through a medium (air, water, etc.) or space Disturbance that carries energy through a medium (air, water, etc.) or space

4. Energy “spreads out” as a wave travels wave front

5. 2 Categories 1. Mechanical – requires a medium

6. 2 Categories 2. Electromagnetic – does not need a medium

7. Mechanical Waves

8. 2 Ways to Classify Transverse Longitudinal

9. Parts of a Transverse Wave

10. Transverse Waves Medium vibrates perpendicular to direction of wave travel

11. Longitudinal Waves Medium vibrates parallel to direction of wave travel

12. Parts of a Longitudinal Wave

13. Lab – Wave Behavior

14. Waves – Day 2

15. Wave Properties

16. Wavelength ( ) Distance between 2 identical parts of a wave Unit – m

17. Period (T) Time for one full wavelength Unit - s

18. Frequency ( f ) # of waves that pass by a given point per second Unit - Hz

19. Sound Frequency Ranges

20. Frequency Generator Demo

21. Light Frequencies

22. Electromagnetic Spectrum

23. Frequency and Period Higher frequency = less time f = 1/T

24. Wave Speed Depends on the medium Depends on the medium Approx. 340 m/s in air Approx. 340 m/s in air 3-4 Xs faster in water 3-4 Xs faster in water 15 – 20 Xs faster in solids 15 – 20 Xs faster in solids

25. Why differences? Density of medium determines speed Density of medium determines speed

26. Speed of Light (c) Light is EMG wave – requires no medium Light is EMG wave – requires no medium 3 X 10 8 m/s in space 3 X 10 8 m/s in space Slower in air and water Slower in air and water

27. Wave Math

28. Equations

29. Lab – Modeling Transverse Waves

30. Wave Interaction, etc. – Cover on Day 3

31. Reflection Not only light rays Not only light rays Bouncing back of wave when it meets surface or boundary Bouncing back of wave when it meets surface or boundary

32. Diffraction Bending of a wave as it passes an edge or an opening Bending of a wave as it passes an edge or an opening

33. Refraction Bending of waves as they pass from one medium to another Bending of waves as they pass from one medium to another

34. Interference Combination of waves that exist in the same place at the same time Combination of waves that exist in the same place at the same time Constructive Constructive Destructive Destructive

35. Constructive Interference

36. Destructive Interference

37. Standing Waves Caused by constructive interference Caused by constructive interference Nodes – 0 amp. Nodes – 0 amp. Antinodes – max amp. Antinodes – max amp.

38. Standing Waves

39. Forced Vibration One object forces another to vibrate One object forces another to vibrate

40. Natural Frequency An objects inherent frequency An objects inherent frequency Frequency at which an object, once energized, will vibrate Frequency at which an object, once energized, will vibrate

41. Resonance Increase in amplitude when the forced vibration equals the natural frequency of the vibration Increase in amplitude when the forced vibration equals the natural frequency of the vibration

42. Tacoma Narrows Bridge, 1940

43. Sound and Light – Cover on Day 4

44. What are sound waves? Longitudinal waves Longitudinal waves Pressure variations transmitted through matter Pressure variations transmitted through matter

45. Pitch Pitch = frequency Pitch = frequency Human hearing – 20 Hz to 20,000 Hz Human hearing – 20 Hz to 20,000 Hz

46. Sound Waves and Pitch Wave fronts compressed as object moves toward you – higher pitch Wave fronts compressed as object moves toward you – higher pitch Wave fronts spread apart when moving away – lower pitch Wave fronts spread apart when moving away – lower pitch

47. Doppler graphic

48. Doppler Effect Observed change in the frequency of a wave when the source (or observer) is moving Observed change in the frequency of a wave when the source (or observer) is moving

49. Electromagnetic Waves Electric and magnetic fields of moving charges Electric and magnetic fields of moving charges No medium needed No medium needed v = c = 3.00 X 10 8 m/s v = c = 3.00 X 10 8 m/s

50. Electromagn etic Wave Picture

51. Electromagnetic Spectrum

52. How do Polaroid glasses work?

53. Polarization of Light Picture

54. picture

55. Picture

56. Polarization Polarizing material contains slots allowing only 1 direction of light waves to pass through Polarizing material contains slots allowing only 1 direction of light waves to pass through

57. Color and Light An apple looks red because… An apple looks red because… All light except red is absorbed; red light is reflected All light except red is absorbed; red light is reflected

58. Color and Light video?