Waves

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Across
  1. 4. Path difference necessary for constructive superposition
  2. 8. Refractive index of air/vacuum
  3. 9. The largest angle of incidence for which refraction can occur.
  4. 11. When 2 (or more) waves meet the total displacement at any one point is sum of their individual displacements at that point.
  5. 13. 180 degrees (3,2,5)
  6. 17. Another term for ‘bright fringe’
  7. 18. When a wave changes direction due to a change in velocity
  8. 19. Emission, When a photon causes an electron to drop to a lower energy state
  9. 21. When 2 (or more) waves have the same frequency and a constant phase difference.
  10. 24. >700nm
  11. 26. hf (6,6)
  12. 27. When a wave enters a denser medium it refracts …(7) the normal
  13. 29. A small, cheap, efficient type of laser
  14. 30. <400nm
  15. 31. The smallest possible amount of light energy
  16. 33. Dark image with coloured lines
  17. 36. The spreading out of a wave as it passes through a gap or around an obstacle.
  18. 37. In terms of wavelength, the distance between two adjacent nodes
  19. 38. Number of complete oscillations in 1 second
  20. 40. Transverse wave that oscillates in only one plane.
  21. 41. Line showing points on a wave that are in phase
  22. 43. Phase difference necessary for destructive superposition
Down
  1. 1. Energy necessary to remove an electron from an atom (hint: not φ)
  2. 2. 0 or 360 degrees (2,5)
  3. 3. The minimum amount of energy necessary to remove an electron for the surface of a metal (4,8)
  4. 5. Type of optical fibre designed to prevent multimode dispersion
  5. 6. Another term for ‘dark fringe’
  6. 7. The minimum frequency photon necessary to remove an electron for the surface of a metal
  7. 10. Rainbow spectrum with dark lines
  8. 12. When more electrons are in a higher energy state than an adjacent lower state (10,9)
  9. 14. For maximum diffraction the wavelength and width of the gap must be the … (4)
  10. 15. Maximum displacement of a wave
  11. 16. Distance between any point and the nearest point on the wave which is in phase with it
  12. 20. Waves that have oscillations in the same direction as the wave travels.
  13. 22. Waves of only one particular frequency and wavelength (13)
  14. 23. Type of wave where the amplitude of every point on the wave is the same (providing no energy loss)
  15. 25. Waves that have oscillations at right angles to the direction that the wave travels.
  16. 28. Type of wave where the amplitude varies between adjacent nodes and antinodes
  17. 32. Time taken for one complete oscillation (4,6)
  18. 34. The result of destructive superposition within a standing wave
  19. 35. The result of constructive superposition within a standing wave
  20. 39. 700nm
  21. 42. 400nm