SP4 Students will investigate the properties o f waves.

1. SP4 Students will investigate the properties of waves.

7. Warm-up: An electromagnetic wave begins with an electric Charge (like an electron). 2. The electric charge has an electric field The electric field creates a magnetic field These fields are perpendicular to each other This transverse wave has a wave length.

9. Austin Lanham’s Quantum Physics’ Double Slit Experiment

10. Photons depend on the frequency of the wave not the amplitude (energy).

12. Objects can absorb light, reflect light, and transmit light depending on the type of matter they are made of.

13. Opaque only absorbs light and reflects it. The blue cup is an example of an opaque material.

14. Aluminum foil is an example of an opaque material because it reflects light

15. Translucent materials allow some light to pass through them. Which cup is translucent?

16. Transparent materials transmit almost all the light. The clear plastic cup is transparent.

18. Wave Properties of Light • Reflection • Refraction • Diffraction • Interference

19. Normal incident beam reflected beam A. Reflection • Reflection • when a wave strikes an object and bounces off

20. The Law of Reflection says that the angle of Incidence always equals the angle of reflection.

21. Diffused reflection

22. SLOWER FASTER B. Refraction • Refraction • bending of waves when passing from one medium to another • caused by a change in speed • slower (more dense) light bends toward the normal • faster (less dense)  light bends away from the normal

23. B. Refraction • Example: View explanation.

24. C. Diffraction • Diffraction • bending of waves around a barrier

25. D. Interference • Interference • constructive  brighter light • destructive  dimmer light

26. Every material has an index of refraction, the larger the index, the greater the amount by which the speed of light is reduced.

27. Car side mirrors do not work when they are covered in frost. What does frost do to the surface of a mirror to cause diffuse reflection?

28. There are two areas in this picture that show light refraction. What is causing the refraction in both?

29. Each wave length of visible Light is a different color. When an object reflects that wavelength we See that particular color.

30. B. Seeing Colors • White light • contains all visible colors - ROY G. BIV • In white light, an object… • reflects the color you see • absorbs all other colors ABSORBS ALL COLORS REFLECTS ALL COLORS

31. B. Seeing Colors • The retina contains… • Rods - dim light, black & white • Cones - color • red - absorb red & yellow • green - absorb yellow & green • blue - absorb blue & violet Stimulates red & green cones Stimulates all cones

32. Test for red-green color blindness. B. Seeing Colors • Color Blindness • one or more sets of cones does not function properly

33. C. Mixing Colors • Primary light colors • red, green, blue • additive colors • combine to form white light • EX: computer RGBs View Java Applet on primary light colors.

34. C. Mixing Colors • Filter • transparent material that absorbs all light colors except the filter color View Java Applet on filters.

35. C. Mixing Colors Light Pigment When mixing pigments, the color of the mixture is the color of light that both pigments reflect.

36. Bright colors are constructive interference Dim colors or black fringes are destructive interference

37. C. Mixing Colors • Pigment • colored material that absorbs and reflects different colors • Primary pigment colors • cyan, magenta, yellow • subtractive colors • combine to form black • EX: color ink cartridges

38. A filter is a translucent material that lets one or more colors pass through, but absorbs the rest. The color of a filter is the color of light that it lets through.

39. If you looked at green grass with red Sun glasses, the grass would look black. The color green reflected to your eyes Would be absorbed by the glasses. Since the glasses only let red light through.

40. Choices • A – Home interior presentation • B – Teaching a class of Bass Pro Shop on the art of spear fishing • C – Teaching a 4th grade class on mirrors

41. Groups: Choice A Soft Blue Book page 212 Using the materials provided you, prepare a home interiors presentation on the following: The types of windows available for an upstairs bathroom. Based on the science of light, and the customers’ needs, explain which window works best under certain conditions.

42. Choice B You are making a presentation and teaching a class for Bass Pro Shop on the art of spear fishing. Be sure to discuss the behavior of light in different mediums and the index of refraction using the materials provided you.

43. Choice C You are teaching a 4th grade class on mirrors. Design a hands on activity using the materials provided for your students to learn about the laws of regular and diffused reflection. You might want to use a County Fair theme and make a fun house with different kinds of mirrors.

44. Please read the paragraph on page 215. What causes the mirage below?