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Gunn effect

[guhn] /gʌn/
noun, Physics, Electronics.
the onset of microwave oscillations in a thin slice of a semiconductor when a voltage exceeding a given value is applied across the slice.
Origin of Gunn effect
named after J. B. Gunn (born 1928), British physicist, who discovered the effect in 1963 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for Gunn effect

Gunn effect

a phenomenon observed in some semiconductors in which a steady electric field of magnitude greater than a threshold value generates electrical oscillations with microwave frequencies
Word Origin
C20: named after John Battiscombe Gunn (1928–2008), British physicist
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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