ABSTRACT
When sound is generated continuously within a closed cavity, a steady state is attained in which the wave motion is that of a standing wave. If the frequency of the source happens to coincide with a natural frequency of the system then resonance will occur. When the enclosure is of simple geometry, and the properties of the walls are known, solutions of the wave equation can be found that satisfy the boundary conditions. These provide expressions which relate the resonance frequencies and linewidths to the speed and absorption of sound in the medium, and thereby form a basis for the measurement of those quantities.
