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Appendix I:A-2. Reflections
diagram of sound field reflectionsThe sound that a noise source radiates in a room is reflected by the walls, floor, and ceiling. The sound will again be reflected when it strikes another boundary, with some absorption of energy at each reflection.
  • The net result is that the intensity (or pressure) of the sound is different from what it would be if the reflecting surfaces were not there.
    • The sound pressure at a given position in the room is made up of sound traveling directly from the source and sound coming from other directions as a result of reflection. Close to the source of sound, there is little effect from these reflections because the direct sound dominates.
    • Under such circumstances, the sound pressure does not decrease as rapidly as predicted by the inverse-square law.

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