Reviewing Sound and Light Waves

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Across
  1. 4. The lowest point of a wave below the rest position
  2. 6. A light ray approaching a surface
  3. 8. Empty space with no matter
  4. 16. The angle between the refracted ray and the normal
  5. 17. Sideways reversal in a mirror image
  6. 21. The highest point of a wave above the rest position
  7. 25. An image that cannot be projected on a screen
  8. 28. A reflected sound wave that returns to the listener
  9. 29. The bending of light as it changes medium
  10. 30. The angle between the incident ray and the normal
  11. 31. The distance between two identical points on a wave
  12. 32. A particle of light energy
  13. 33. A piece of glass that splits white light into colors
  14. 36. Allows some light through but scatters it
  15. 37. A mirror that curves outward
  16. 38. Something that gives off or reflects light
  17. 40. A vibration that travels through matter as energy
  18. 41. How tightly packed the particles in a material are
  19. 42. The three basic colors of light that combine to make white
Down
  1. 1. The maximum displacement of a wave from its rest position
  2. 2. The splitting of white light into different colors
  3. 3. How high or low a sound appears to the ear
  4. 5. Does not allow light to pass through
  5. 7. Light that passes through a material
  6. 9. A drawing showing the path of light rays
  7. 10. A picture formed by light rays from an object
  8. 11. A light ray that has bent when changing medium
  9. 12. An imaginary line perpendicular to a surface
  10. 13. A mirror that curves inward
  11. 14. A rapid back and forth movement that creates sound
  12. 15. Colors made by mixing two primary colors
  13. 18. Allows light to pass through clearly
  14. 19. The range of colors in visible light
  15. 20. A light ray that bounces off a surface
  16. 22. Light containing all colors of the spectrum
  17. 23. How loud or quiet a sound appears to the ear
  18. 24. Light bouncing off a surface
  19. 26. Light energy taken in by a material
  20. 27. The angle between the reflected ray and the normal
  21. 34. A substance through which sound waves can travel
  22. 35. right! Let me extract ALL the terms and phrases from the document:
  23. 39. A flat mirror that produces virtual images