Sound

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Across
  1. 2. The type of medium through which sound cannot travel (4 letters)
  2. 4. The type of wave in which sound travels (10 letters)
  3. 6. The organ in humans that helps in the production of sound (7 letters)
  4. 7. The highness or lowness of a sound depends on this property
  5. 8. The part of the ear that collects sound waves (6 letters)
  6. 9. The number of vibrations per second (9 letters)
Down
  1. 1. The unit of frequency (5 letters)
  2. 3. The term for sounds that are too high for humans to hear (10 letters)
  3. 5. The property of sound that determines its loudness (10 letters)
  4. 10. The effect that causes sound to be heard after reflection (7 letters)