Acoustics

2. measured in watts, people perceive as loudness
3. measured in decibels
6. threshold of human hearing in decibels
7. up to 45 is the stc rating for most interior walls
9. a length of a single cycle of a wave, distance between one peak and one trough
11. can improve stc in a partition
14. reduction in the magnitude of sound
16. as frequency increases, wavelength
17. measured in hertz cycles per second
18. sound travels through diffusion and this
19. what the a stands for in CAC
21. sound travels through this ie; water, air, wood, steel
22. the a in AC which is a measure for rating speech privacy of a ceiling in an open plan environment

1. minimum CAC for open plan offices
4. difference in decibels between the sound in source room in receiving room
5. sound travel type found in larger rooms
8. easily heard in small rooms, especially rooms with little or no geometric complexity
10. number system to rate a ceiling's efficiency as a barrier to sound intrusion btwn two closed rooms
12. initially created by vibration
13. number system used to evaluate transmission loss in an assembly
15. threshold of pain in decibels
20. stc where loud speech can be heard and understood fairly well