Across
- 3. length Distance
- 4. Time
- 5. Across
- 7. effect Pitch
- 10. Peak
- 11. wave Perpendicular
- 12. Spread
- 13. wave Parallel
- 15. Rate
- 18. Energy
- 20. waves Sound
Down
- 1. interference Increase
- 2. Interference Cancel
- 6. Bounce
- 8. Bend
- 9. speed Velocity
- 14. Overlap
- 16. waves Light
- 17. Substance
- 19. Height
