Physical words

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Across
  1. 3. Maximum wave displacement
  2. 5. Distance between two crests
  3. 8. Wave cycles per unit time
  4. 9. Highest point of a wave
  5. 10. Closely packed particles/matter
Down
  1. 1. Turned upside down/reversed
  2. 2. Interface between two regions
  3. 4. Substance for wave propagation
  4. 6. Lowest point of a wave
  5. 7. Wave oscillates perpendicular