Rayleigh disk

noun
Ray·leigh disk | \ˈrā-lē-\

Definition of Rayleigh disk 

: a thin circular disk of mica or aluminum that when suspended in a beam of sound tends to set itself at right angles to the direction of propagation and by the angle assumed gives a measure of the sound intensity

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History and Etymology for Rayleigh disk

after Baron John W. S. Rayleigh †1919 English physicist

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