Sound and Light

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Across
  1. 2. The distance between successive crests or successive troughs.
  2. 4. When a forced frequency matches its natural frequency. (Think of the swaying bridge.)
  3. 9. How strong a wave is from the midpoint of a wave.
  4. 11. A unit measuring frequency per second.
  5. 13. Any two colors that, when added, produce white light.
  6. 14. The darker part of a shadow where light is blocked.
  7. 15. A wave in a direction parallel to the direction the wave travels.
  8. 18. A wave in which the medium vibrates in a direction perpendicular to the direction in which the wave travels.
  9. 19. Happens during a longitudinal wave in which the wave is condensed.
  10. 21. Happens during a longitudinal wave of reduced pressure
  11. 23. A sound frequency too high to hear by the normal human ear.
Down
  1. 1. An energy-carrying wave composed of oscillating electric and magnetic fields that regenerate one another,
  2. 3. Materials through which light can pass in straight lines.
  3. 5. The number of vibrations per unit of time.
  4. 6. The loud sound resulting from the incidence of a shock wave.
  5. 7. Where two waves intersect and causes the waves to either be amplified or cancelled.
  6. 8. A return of Light rays from a surface.
  7. 10. A partial shadow where not all the light is blocked.
  8. 12. The range of waves in frequency from radio waves to gamma rays.
  9. 16. A sound frequency too low to be heard by the normal human ear.
  10. 17. A shift in frequency due to movement either towards or away from a receiver. (Think car horn)
  11. 20. The bending of an ray of light when it passes from one transparent medium to another.
  12. 22. Materials that absorb light where light cannot pass