Waves

12345678
Across
  1. 1. Distance from a point on one wave to the same point on the next (10)
  2. 3. Distance from equilibrium (12)
  3. 7. Where displacement = 0 (11)
  4. 8. Waves where vibrations are perpendicular to direction of travel (10)
Down
  1. 2. Waves where vibrations are parallel to direction of travel (12)
  2. 4. Point of maximum or minimum displacement (9)
  3. 5. Time taken for one wave to pass (6)
  4. 6. Number of waves per second (9)