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19
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Across 1. Lowest point of a wave 4. Distance from the median to the crest 7. Highest point of a wave 9. Time it takes a single wave to pass a given point 12. When a wave bends as it passes an opening or an edge 14. Wave where particle motion is parallel to the motion of the wave 17. Wave where particle motion is perpendicular to the motion of the wave 18. Unit of measure for frequency 19. Distance from crest to crest 20. Distance from the top of a wave to the bottom

Down 2. When a wave bounces off of a surface 3. Wave that can travel through a vacuum 5. Matter that waves travel through 6. Wave that cannot travel through a vacuum 8. When a wave bends as it goes from one medium to another 10. Observed change in frequency when the source or observer is moving 11. Interference where the amplitude of the wave increases 13. How fast a wave moves 15. Interference where the amplitude of the wave decreases 16. Number of waves that pass a given point in 1 second