Physics Crossword

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Across
  1. 2. Length of a cycle in space
  2. 4. Concentration of force
  3. 7. Number of cycles per second
Down
  1. 1. Type of wave where particle motion travels parallel to wave propagation direction
  2. 2. Cyclical transfer of energy
  3. 3. Mass per volume
  4. 5. Type of wave where particle motion travels perpendicular to wave propagation
  5. 6. Distance sound can travel per unit of time