Helmholtz resonance

Helmholtz resonance or wind throb is air resonance in a cavity. Examples:
Blowing across the top of an empty bottle. 
Whistling

The name comes from a device created in the 1850s by Hermann von Helmholtz, the Helmholtz resonator. He used it to find the various frequencies or musical pitches in music and other complex sounds.Helmholtz, Hermann von (1885), On the sensations of tone as a physiological basis for the theory of music, Second English Edition, translated by Alexander J. Ellis. London: Longmans, Green, and Co., p. 44. Retrieved 2010-10-12.

 References 

Category:Sound