Waves

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Across
  1. 4. what is needed for sound to occur
  2. 6. the height of a wave
  3. 7. name of a sound wave
  4. 9. name of a light wave
  5. 12. how light waves travel
  6. 13. sound waves needs but light waves do not
  7. 15. the lowest point of a wave
  8. 17. the amount of vibrations per second
Down
  1. 1. a substance in which sound waves travel
  2. 2. where particles are pulled apart
  3. 3. light waves travel but sound waves can not
  4. 5. how loud or soft something is; amplitude
  5. 8. the distance between two points on a wave
  6. 10. empty space; no matter; no particles
  7. 11. the highest point of a wave
  8. 12. has a relationship with frequency
  9. 14. where particles are pressed together
  10. 16. how sound waves travel