waves crossword puzzle

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Across
  1. 8. the interference of two waves of equal frequency
  2. 10. the act of reflecting
  3. 12. higher energy than ultraviolet can penetrate soft tissue
  4. 13. light,uvrays,visible light
  5. 14. can raise thermal energy of products
  6. 16. the distance, measured in the direction of propagation of a wave
  7. 18. the absolute value of the maximum displacement from a zero value during one period of an oscillation.
  8. 19. speed of a wave as it moves foward
Down
  1. 1. a wave in which the direction of displacement is the same as the direction of propagation, as a sound wave.
  2. 2. radiation consisting of electromagnetic waves,
  3. 3. the process in which two or more light, sound, or electromagnetic waves of the same frequency combine to reinforce or cancel each other,
  4. 4. the change of direction of a ray of light, sound, heat,
  5. 5. the shift in frequency
  6. 6. rhythmic disturbances that carry energy through matter
  7. 7. penetrate food to dreate thermal energy
  8. 9. a wave in which the direction of displacement is perpendicular to the direction of propagation,.
  9. 11. emitted radioactive atoms
  10. 15. hvae the lowest energy
  11. 17. the number of periods or regularly occurring events of any given kind in unit of time, usually in one second.