Sound and Light

1. Sound and Light The Nature of Light Sound and Light

2. Constructive and Destructive Interference Sound and Light

3. Light Can Be Modeled As a Wave • Light Diffracts like a wave • Light also reflects and refracts Sound and Light

4. Max Planck and Albert Einstein • Nobel prize winners in physics • Discovered that light, which usually travels in waves, sometimes behaves as if it were made up of a stream of small quantities, or quanta, of energy Sound and Light

5. Photon • Small unit of light energy or electromagnetic radiation. “Packets” • No mass, bundle of energy. • The energy, E, of a photon is calculated using the equation E = hu, • Where h is Planck's constant and u is the frequency of the light. Sound and Light

6. Atoms Emit Energy As Photons Absorbs Energy Sound and Light

7. Sometimes Light is modeled as a Stream of Particles • Explains why light can travel through the vacuum of space • Light can knock electrons off a metal plate Sound and Light

8. Light Has a Dual Nature • Duality • Different characteristics depending on the situation • Scientists use different models depending on what they are studying Sound and Light

9. Photon Self-identity Problems Sound and Light

10. Energy of Light Is Proportional to Frequency • Light is a form of energy. • The energy, E, of a photon is E = hu, • Where h is Planck's constant and u is the frequency of the light. Sound and Light

11. The Speed of Light • In a vacuum it is called ‘c’ • Depends on the medium Sound and Light

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14. The Brightness of Light Depends on the Intensity • The rate at which light energy flows through a given area of space is referred to as its intensity. Sound and Light

15. The Brightness of Light Depends on the Intensity • Light waves spread out spherically from the source • Therefore intensity will drop as distance increases Sound and Light

16. Exploring the Electromagnetic Spectrum Sound and Light

17. Radar • System that uses reflected radio waves • Determine distance, location, shape and speed Sound and Light

18. Sound and Light12.3 Reflection and Color Sound and Light

19. Light Can Be Modeled As a Ray • Light ray is a model of light • Represents light traveling through space in an imaginary straight line Sound and Light

20. When Light Rays Reflect off a Smooth Surface, They Are Reflected in the Same Direction. Sound and Light

21. When Light Rays Reflect off a Rough Surface, They Scatter in Many Different Directions. Diffuse reflection Sound and Light

22. The Law of Reflection • States that when light rays reflect off a surface the angle of incidenceequals the angle of reflection. Sound and Light

23. The Law of Reflection Ө = Angle of incidence Ө’ = Angle of reflection Sound and Light

24. Normal • The theoretical line perpendicular to the surface where light hits a mirror. Sound and Light

25. Virtual Image • An image that results from an apparent path of light rays • Appears behind a mirror • Or in front of a lens Sound and Light

26. Flat Mirror Sound and Light

27. RealImage • Light rays really exist at the point where the image appears. • Appears in front of a mirror. • Or through a lens. Sound and Light

28. Concave and Convex Mirrors Sound and Light

29. Concave Mirrors • Can create real images Sound and Light

30. Fun House Mirrors Sound and Light

31. Reflection of Green Light by Leaves Life Science, Holt Science and Technology, California edition, Holt Rinehart and Winston, San Francisco, 2001 Sound and Light

32. Seeing Color • Objects have color because they reflect certain wavelengths of light • The object absorbs all the other colors • Your brain interprets each wavelength as color Sound and Light

33. Colored Filters Sound and Light

34. You look at a red tulip, with green leaves, under green light. What would you see? • A black flower with green leaves Sound and Light

35. The Primary Colors of Light and Pigment Light Pigment Additive Subtractive Sound and Light

36. Primary Colors of Printing Sound and Light

37. What are the True Colors? Sound and Light

38. Sound and Light

39. Sound and Light 12.4 Refraction, Lenses and Prisms Sound and Light

40. Refraction • Bending of light rays • From one medium to another • Due to changing speeds Sound and Light

41. When light moves from a material in which its speed is higher to a material in which its speed is lower, it is… • Bent toward the normal. Sound and Light

42. If a light moves from a material in which its speed is lower to one in which its speed is higher, • The ray is bent away from the normal Sound and Light

43. Refraction in the Atmosphere • Creates mirages • Are a virtual image • Heat leads to diffraction that bends the light toward the sky Sound and Light

44. Total Internal Reflection • Light enters one end of a fiber optic cable and exits the other end • Complete reflection • Between two mediums • Angle of incidence exceeds the critical angle Sound and Light

45. Convex Lens Sound and Light

46. Convex Lens Sound and Light

47. Convex Lens Sound and Light

48. Concave Lens Sound and Light

49. diverging lenses • Concave Len. • It bends light outward and can only create a virtual image. Sound and Light

50. The Eye thecorneais responsible for the largest percentage of light refraction Sound and Light