Sound waves

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Across
  1. 3. The height of a sound wave; determines how loud the sound is.
  2. 6. Type of wave in which particles vibrate parallel to the direction of travel.
  3. 9. Type of wave in which particles vibrate perpendicular to the direction of travel
  4. 13. A reflected sound wave.
  5. 15. The substance (solid, liquid, or gas) through which sound travels.
  6. 16. Number of vibrations per second; measured in hertz (Hz).
  7. 17. The region of a sound wave where particles are close together.
  8. 18. Perceived intensity of sound
Down
  1. 1. The region of a sound wave where particles are spread out.
  2. 2. The bouncing back of sound waves from a surface.
  3. 4. Distance between two consecutive compressions or rarefactions.
  4. 5. Sound waves with frequencies above the range of human hearing.
  5. 7. Distance sound travels per unit time
  6. 8. The unit used to measure sound intensity
  7. 10. The back-and-forth motion that produces sound.
  8. 11. A space with no particles — sound cannot travel through it.
  9. 12. The unit of frequency.
  10. 14. How high or low a sound is, depending on frequency.