1 To comply with Department of Defense changes to common access cards, and to comply with Homeland Security Presidential Directive 12, the Fort Knox One Stop In-processing Center has recently started implementing changes to the CAC issuing process.
acoustics - the study of the physical properties of sound. acoustic radiation pressure - (acoustics) the pressure exerted on a surface normal to the direction of propagation of a sound wave. physical science, physics - the physical properties, phenomena, and laws of something; he studied the physics of radiation. harmonics - the study of musical sound.
The most important variables for acoustical privacy in the normal open plan office are the distance between two people, the level of background sound, the orientation of the person talking, and how loud the person is talking. Any one of these variables can affect acoustical privacy.