Physical Science - Wave Properties of Light.pptx

Physical Science - Wave Properties of Light.pptx

1. PHYSICAL SCIENCE BEHAVIOR OF ELECTRONS AND WAVE PROPERTIES OF LIGHT

2. OBJECTIVES At the end of this presentation, you are expected to: 1. cite experimental evidence showing that electrons can behave like waves (S11/12PS-IVg-64); 2. enumerate the wave properties of light ; and 3. differentiate dispersion, scattering, interference, and diffraction (S11/12PSIVh-65)

3. 01 BEHAVIOR OF ELECTRONS AND WAVE PROPERTIES OF LIGHT Evidences of Wave-Like Behavior of Electrons

4. 4 1 word, Cebuano

5. 5

6. 6 1 word, English

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8. 8 1 word, English

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10. Is ELECTRON a PARTICLE or a WAVE ?

11. Two famous scientists in the 1600s, Christiaan Huygens and Isaac Newton were both working on the theories for the behavior of light.

12. Light is a wave. Light is made up of corpuscles (particles).

13. Light is a wave as shown in my double-slit experiment. Thomas Young

14. Constructive interference vs. Destructive interference

15. Constructive interference vs. Destructive interference

16. Light is made up of particles. Behold! The wave-particle behavior of light. Einstein Photoelectric Effect

17. After the wave-particle dual behavior of electron in light was accepted, another scientist took a leap by testing the hypothesis in MATTER.

18. LET’S REVIEW! What is MATTER? Why MATTER matters? What are the parts of an ATOM?

19. Electrons act both as particles and waves. Louis de Broglie Modern Double-Slit Experiment

20. Louis de Broglie Modern Double-Slit Experiment

21. LET’S PONDER! Relate yourself about the dual nature of both light and electrons (behave like particles and waves). Was there an instance in your life that you behave like a particle (making an impact to other lives) and a wave (being interfered but not disturbed)? Perform in a creative way (talk show, drama, flash news report, etc.).

22. RUBRICS FOR SCORING 10 8 6 4 2 Creativity The group performed an outstanding performance showing creativity. The group performed a satisfactory performance showing creativity. The group performed a good performance showing creativity. The group performed a fair performance showing creativity. The group performed a poor performance showing creativity. Unity Unity and understanding is consistently present throughout the performance. Unity and understanding is mostly present throughout the performance. Unity and understanding is present but a member did not participate. Unity and understanding is mostly present throughout the performance. Unity and understanding is poor throughout the performance. Concept The concept of the performance is outstanding. The concept of the performance is satisfactory. The concept of the performance is good. The concept of the performance is fair. The concept of the performance is poor. Confidence Everyone in the group shows excellent confidence. Most of the group shows excellent confidence. Half of the group shows excellent confidence. Less than half of the group shows excellent confidence. None of the group shows excellent confidence.

23. 02 BEHAVIOR OF ELECTRONS AND WAVE PROPERTIES OF LIGHT Wave Properties of Light

24. PROPERTIES OF LIGHT There are 7 basic properties of light: Reflection of light Refraction of light Diffraction of light Interference of light Polarization of light Dispersion of light Scattering of light

25. What property of light is shown in the pictures? Reflection of light Refraction of light Diffraction of light Interference of light Polarization of light Dispersion of light Scattering of light 1 2 3 4 5 6 7

26. What property of light is shown in the pictures? 3 Reflection of light 7 Refraction of light 4 Diffraction of light 5 Interference of light 2 Polarization of light 6 Dispersion of light 1 Scattering of light 1 2 3 4 5 6 7

27. 03 Dispersion Interference 04 Diffraction Wave Properties of Light 01 02 Scattering

28. The separation of visible light into its different colors (ROYGBIV) is known as dispersion . Dispersion

29. The separation of visible light into its different colors (ROYGBIV) is known as dispersion . Dispersion

30. Diffraction is the bending of light around corners such that it spreads out and illuminates areas where a shadow is expected. Diffraction

31. Diffraction is the bending of light around corners such that it spreads out and illuminates areas where a shadow is expected. Diffraction

32. Interference of light is the phenomena of multiple light waves interfering with one another under certain circumstances, causing the combined amplitudes of the waves to either increase or decrease. Interference

33. Interference of light is the phenomena of multiple light waves interfering with one another under certain circumstances, causing the combined amplitudes of the waves to either increase or decrease. Interference

34. Interference Constructive Interference Destructive Interference

35. Interference Constructive Interference This results when the waves arrive together at a point in phase, that is, crest to crest or trough to trough. The result is a reinforced wave of amplitude equal to the sum of the amplitudes of the two waves.

36. Interference Destructive Interference This results when the waves arrive together at a point 180 out of phase, that is crest to trough. The resultant wave is of a lesser amplitude equal to the difference of the amplitudes of the individual waves.

37. Interference of light is the phenomena of multiple light waves interfering with one another under certain circumstances, causing the combined amplitudes of the waves to either increase or decrease. Interference

38. Scattering is the process in which air molecules absorb sunlight and reemit in various directions. Scattering

39. —Oprah Winfrey “Know what sparks the light in you. Then use that light to illuminate the world.”

40. PHYSICAL SCIENCE Various LIGHT Phenomena

41. Why is our reflection on the concave and convex sides of a spoon looks different? How mirages are formed? Why does light from a red laser passes more easily though red cellophane than green cellophane? Why does clothing of certain colors appear different in artificial light and in sunlight? What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed? Why clouds are usually white and rainclouds dark? Why the sky is blue and sunsets are reddish? S11/12PS-IVh-66

42. Why is our reflection on the concave and convex sides of a spoon looks different? The shiny spoon is like a mini mirror, but with a curve in it. The front of the spoon is a CONCAVE surface, and the back is a CONVEX surface.

43. A mirage is an optical phenomenon that creates the illusion of water and results from the refraction (bending) of light through a non-uniform medium . Mirages are most commonly observed on sunny days when driving down a roadway. How mirages are formed?

44. Green cellophane will only allow green light to pass through it . The cellophane absorbs other colors of light. For example, green light will not pass through red cellophane. The green light is absorbed by the red cellophane. However, green light will pass through green cellophane. As a general rule each color filter (e.g. glass or cellophane) will only allow light of its own color to pass through. Why does light from a red laser passes more easily though red cellophane than green cellophane?

45. A halo is a ring of light surrounding the sun or moon . Most halos appear as bright white rings but in some instances, the dispersion of light as it passes through ice crystals found in upper level cirrus clouds can cause a halo to have color. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?

46. Sundogs, also known as mock suns or " parhelia ", are a pair of brightly colored spots, one on either side of the sun . What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?

47. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?

48. Rainbows result from refraction of sunlight in falling water droplets plus reflection of the light from the back of the droplet. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?

49. As the droplets get smaller , red weakens . In fine mist, all colors except violet may disappear. What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?

50. The secondary rainbow is about 10° further out from the antisolar point than the primary bow, is about twice as wide, and has its colors reversed . What are haloes, sundogs, primary rainbows, secondary rainbows, and supernumerary bows and how are they formed?

51. Why clouds are usually white and rainclouds dark? Rain clouds scatters more sunlight because they have bigger water droplets . This means that less light from the Sun reaches the bottom of the cloud , giving a gray appearance.

52. Why the sky is blue and sunsets are reddish?

53. Why the sky is blue and sunsets are reddish? When incoming sunlight encounters a heavy concentration of particles in the atmosphere, the shorter wavelengths of light (violet and blue) are scattered away , resulting in a red sunset . Red sunsets are often observed from a beach because of the high concentration of salt particles suspended in the air over the oceans. These particles effectively scatter shorter wavelengths of light, producing red sunsets.

54. FORMATIVE ASSESSMENT

55. 1. The blue color of the sky is due to: A. selective scattering of visible light by air molecules. B. the filtering effect of water vapor in the earth's atmosphere. C. reflection of sunlight off the earth's oceans. D. transmission of visible light through the ozone layer in the earth's stratosphere.

56. 2. Blue skies occur during the day due to: A. Diffraction B. Mie scattering C. Rayleigh scattering D. Tyndall Effect

57. 3. The following correctly explains light passing through a cellophane except: A. As white light passes through red cellophane, the cellophane absorbs all colors except red. B. Green light can’t easily pass through green cellophane because it shows the same color. C. A red light passing through red cellophane will simply go through since they have the same color. D. Red light can’t easily pass through green cellophane since the cellophane absorbs the red light.

58. 4. This side of the spoon gives you an inverted reflected image. A. Concave B. Convex C. Mirage D. Halo

59. 5. What causes a mirage? A. scattering of light by air molecules. B. the bending of light by air of different densities. C. a thin layer of moist air near the ground. D. reflection of light from a hot surface.