Sound

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Across
  1. 5. The vibrations are at right angles to the direction the wave moves.
  2. 6. When waves add together so that they add up or cancel each other out.
  3. 9. A property of sound determined by its frequency.
  4. 10. The distance from the middle to the top or bottom of a wave.
Down
  1. 1. A wave where the vibrations are in the same direction as the direction the wave moves.
  2. 2. The number of complete waves produced per second.
  3. 3. Sound at a frequency greater than 20,000Hz.
  4. 4. The distance between two identical points on a wave.
  5. 7. When a sound wave reflects off an object.
  6. 8. Something that moves backwards and forwards.