| 单词 | Hertz effect | 
| 释义 | Hertz effect [`hǝrts i´fekt]  ELECTROMAGNETISM A dependence of the attenuation of a linearly polarized electromagnetic wave passing through a grating of metal rods on the angle between the electric vector and the rod direction, with the attenuation being a minimum when the two are perpendicular.  ELECTRONICS Increase in the length of a spark induced across a spark gap when the gap is irradiated with ultraviolet light.  | 
	
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