Waves

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Across
  1. 5. wave oscillation that are parallel to the direction of the motion
  2. 7. strength of the sound
  3. 9. the amount of oscillations passing by per second
Down
  1. 1. length of time for one oscillation
  2. 2. amplitude that corresponds to brightness
  3. 3. amplitude that corresponds to loudness
  4. 4. wave oscillations that are perpendicular to the direction of motion
  5. 6. something associated with vibrations of matter
  6. 8. a requirement that is needed for sound to travel