Sound

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Across
  1. 3. A form of energy that travels through a medium as vibrations.
  2. 4. A rapid back-and-forth movement.
  3. 5. A longitudinal wave caused by vibrating particles.
  4. 7. How high or low a sound is
  5. 8. The material through which sound travels (solid, liquid or gas).
  6. 9. A transfer of energy without transfer of matter.
  7. 10. A reflected sound wave.
  8. 11. The unit of frequency.
Down
  1. 1. A wave where particles vibrate parallel to the direction of energy transfer.
  2. 2. The number of vibrations per second.
  3. 4. How loud or quiet a sound is
  4. 6. The range of sound humans can hear (approximately 20 Hz – 20,000 Hz).