Sound waves and energy

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Across
  1. 4. The number of occurrences of a repeating event per unit of time
  2. 6. The action of waves going apart or a decrease in the density of something
  3. 8. across
  4. 9. The rate at which someone or something is able to move or operate
  5. 11. a repeated back and forth or up and down motion
  6. 13. Waves Waves that only travel through a medium
Down
  1. 1. movement back and forth at a constant speed
  2. 2. the distance between two corresponding parts of a wave
  3. 3. The highest point of a wave
  4. 5. The action of waves coming together or being compressed
  5. 7. A disturbance that transfers energy from place to place
  6. 10. The lowest point on a wave
  7. 12. The ability to do work