Crossword for IMG1002

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Across
  1. 3. Cycles per second
  2. 6. Scan lines in the same direction
  3. 7. Mechanical wave
  4. 8. One compression to the next compression
Down
  1. 1. Works in medium or vacuum
  2. 2. Same direction particle movement to wave propagation direction
  3. 4. Is needed for sound to travel
  4. 5. Perpendicular particle movement to wave propagation direction