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An incident ray from air strikes dolomite (n = 2.0) at an angle of 30 o from normal.

An incident ray from air strikes dolomite (n = 2.0) at an angle of 30 o from normal. Calculate:  refl &  refr. Chapter 19. Diffraction & Interference. List & describe 3 properties of waves. Diffraction. The bending of light rays when passing a barrier. Diffraction.

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An incident ray from air strikes dolomite (n = 2.0) at an angle of 30 o from normal.

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  1. An incident ray from air strikes dolomite (n = 2.0) at an angle of 30o from normal. Calculate: refl & refr

  2. Chapter 19 Diffraction & Interference

  3. List & describe 3 properties of waves

  4. Diffraction • The bending of light rays when passing a barrier

  5. Diffraction • Named by Francesco Grimaldi by seeing blurred edges of shadows

  6. Isaac Newton • Predicted that light moved in the form of particles to explain diffraction

  7. Christiaan Huygens • Predicted that light moved in the form of waves to explain diffraction

  8. Thomas Young • Proved that light moved in the form of waves by passing light thru a double slit. P 445

  9. Thomas Young • The interference pattern caused by diffraction produced dark & light lines

  10. Monochromatic Light • Light having only one wavelength

  11. Coherent Waves • Waves all in the same phase

  12. Diffraction Interference Light waves nl x nl d a xl L d = l L

  13. Diffraction Interference xl L d = xd L Double slit l =

  14. Calculate wavelength reinforced when waves passing through 2 slits 25 mm apart cast bright lines 4.0 cm apart on a screen 2.0 m away

  15. Calculate wavelength reinforced when waves passing through 2 slits 25 mm apart cast bright lines that make a 37o angle from the principle axis

  16. Diffraction Interference d= distance between slitsw = slit width xd xw L L l = =

  17. Diffraction Interference Light waves nl x nl d a l = d sin a l L

  18. Wave Properties • Propagation • Reflection • Refraction • Diffraction • Interference

  19. Propagation • Within a uniformed medium, the generation of waves that move in straight lines called rays

  20. Reflection • The bouncing of waves off surfaces or medium boundaries

  21. Refraction • The bending of waves when passing from one medium to another

  22. Diffraction • The bending of waves when passing around barriers

  23. Interference • The superimposing two or more waves passing through the same medium simultaneously

  24. Photoelectric Effect • The emission of electrons (e-)from a substance when irradiated

  25. 1st Law of Ph Eff • The rate of e- emission is proportional to the intensity of the incident light

  26. 2nd Law of Ph Eff • The KE of e- emission is independent of the intensity of the incident light

  27. Photoelectric Effect • This led to the discovery that e- in atoms exist in distinct energy levels

  28. Spectroscopy • The study of a substance under continuous excitation energy

  29. Energy of a Wave Ewave = hf

  30. Energy of Matter Ematter = mc2

  31. Duality of Nature Proposed by Louis de Broglie

  32. Duality of Nature All energy transfer exhibits properties of both waves & particles

  33. Duality Formula h mv l =

  34. Calculate the wavelength 2.21 kg of a ball thrown at 20.0 m/s

  35. Calculate the mass of blue light at 442 nm

  36. Calculate the wavelength of a 442 Mg truck moving at 36 km/hr

  37. Calculate the wavelength of a 4.42 x 106 Mg train moving at 72 km/hr

  38. The l of near IR red light is 663 nm. Calculate: E & m of the light

  39. The l of near UV light is 221 nm. Calculate: E & m of the light

  40. Calculate wavelength reinforced when waves passing through 2 slits 25 mm apart cast bright lines that make a 53o angle from the principle axis

  41. Calculate wavelength reinforced when waves passing through a slit 75 mm slit cast bright lines that make a 53o angle from the principle axis

  42. Calculate wavelength reinforced when waves passing through 2 slits 75 mm apart cast bright lines 5.0 cm apart on a screen 2.5 m away

  43. Calculate wavelength reinforced when waves passing through a 15 mm slit cast bright lines 3.0 cm apart on a screen 2.5 m away

  44. A wavelength 180 nm is reinforced when waves passing through a 15 mm slit cast bright lines 3.0 cm apart. What is the screen distance?

  45. A wavelength 18 nm is reinforced when waves passing through a 1.5 mm slit cast bright lines 3.0 cm apart. What is the screen distance?

  46. Review

  47. Calculate wavelength reinforced when waves passing through a 25 mm slit cast bright lines 5.0 cm apart on a screen 2.5 m away

  48. Calculate the mass & energy of UV light at 221 nm.

  49. Calculate Kinetic energy & wavelength of a 442 g ball going 30.0 m/s

  50. Calculate wavelength reinforced when waves passing through a slit 4.5 mm slit cast bright lines that make a 37o angle from the principle axis

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