Sound wave Crossword

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Across
  1. 2. the higher the frequency, the higher the...
  2. 4. sound wave can travel through a...
  3. 5. the height of a sound wave
  4. 7. sound waves travels the fastest through
  5. 8. the cause of sound wave
  6. 9. the antonym of louder
  7. 11. the unit of amplitude
Down
  1. 1. place where sound waves cannot travel
  2. 3. the amplitude of a sound wave
  3. 6. sound wave can be drawn in a...
  4. 10. the unit of frequency