idk

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Across
  1. 2. the number of complete waves that pass a given point in a certain amount of time
  2. 4. the material a wave travels through
  3. 7. the maximum distance the particles of a medium move away from their rest position
  4. 8. part on a longitudinal wave where the particles are far apart
  5. 10. the precipitation of the frequency of a sound
  6. 12. longest wavelength and lowest frequency
  7. 14. parts of light that are reflected from an object
  8. 15. a repeated back-and-forth or up-and-down motion
  9. 17. light moves through an object and bends
  10. 18. a wave that moves a medium in a direction perpendicular to the direction in which the wave travels
  11. 20. when light bounces off a medium
Down
  1. 1. a wave that requires a medium
  2. 3. the distance between two corresponding parts of a wave
  3. 5. the unit of measurement for frequency
  4. 6. energy/waves we can see
  5. 9. part of a longitudinal wave where the particles are close together
  6. 11. a disturbance that transfers energy from place to place
  7. 13. a wave that moves a medium in a direction parallel to the direction in which the wave travels
  8. 16. the lowest part of a transverse wave
  9. 19. the highest part of a transverse wave