Waves crossword puzzle

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Across
  1. 3. transfer energy from one place to another
  2. 4. The highest point on a wave
  3. 7. the vibrations are in the same direction as the motion of the wave
  4. 10. changes in speed of light/temp and densities of the same mediums
  5. 13. how fast the wave was moving
  6. 14. frequency shift due to motion
  7. 15. Frequency
  8. 16. the SI unit of frequency, equal to one cycle per second
  9. 17. the time that it takes to complete one complete cycle
  10. 19. The length from one crest to the other
  11. 20. The height of the wave
  12. 21. corresponds to frequency
Down
  1. 1. Return of a wave back to its original medium
  2. 2. a unit used to measure the intensity of a sound or the power level of an electrical signal by comparing it with a given level on a logarithmic scale
  3. 5. is a longitudinal wave and requires a medium to travel through
  4. 6. molecules far apart
  5. 8. the vibrations are perpendicular to the direction of motion of the wave
  6. 9. Molecules close together
  7. 11. The lowest point on a wave
  8. 12. Forced vibration by another object
  9. 18. How often or how quickly a wave passes by