Across
- 4. equalibrium
- 8. forward vibration of the molecules
- 9. period
- 10. wave vibration
- 11. loudness
- 13. don't require physical medium
- 15. three materials
- 17. one full wave
Down
- 1. causes medium to move perpendicular
- 2. causes wave interference
- 3. when amplitudes are in the same direction
- 5. causes the air to vibrate
- 6. when molecules spread apart
- 7. lowest point
- 12. repeats in spaces
- 14. require physical medium
- 16. highest point