Across
- 1. unit to measure sound intensity
- 3. how high or low sound it
- 4. alters amplitude
- 6. makes algebraic sum
- 8. vibrates as external force
- 9. change in pitch of sound
- 10. stationary resonance pattern
- 13. frequency lower than 20 Hz
- 14. decreases sound volume
- 15. frequency higher than human hearing
- 16. measures fluid flow compressibility
- 19. maximum amplitude
- 21. particles forced together
Down
- 2. crests and troughs align
- 5. matches an objects natural frequency
- 7. minimum amplitude
- 11. vibration rate without force
- 12. reduction of items density
- 17. multiples of lowest fundamental frequency
- 18. velocity exceeding Mach 5
- 20. periodic rhythm