Focusing and Creep

Figure 50-4 Focusing.

The reflection of sound along a curved surface from a source near the surface is called creep (Fig. 50-5). The sound can be heard at points along the surface but is inaudible away from the surface. A space with concave surfaces can become a whispering gallery, a room in which two people can stand at two related focal points of curved surfaces and hear each other's whispers with startling loudness and clarity while remaining unheard by other people in the space.

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