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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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