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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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Origin and Etymology of rayleigh disk

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

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