Across
- 2. Sound that is very low for human beings to hear
- 5. The distance between 2 crust and trough
- 7. The reflection of sound
- 9. Region where the particles are far apart
- 11. The height of the wave
- 12. Created when something vibrates
- 13. Region where the particles are close together
Down
- 1. The travelling of sound
- 3. A movement about a fixed point
- 4. Sounds that is very high for human beings to hear
- 6. The Place where there is no kinds of particles
- 8. A device used for viewing sound waves
- 10. The number of waves generated per second