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单词 Davisson-Calbick formula
释义 Davisson-Calbick formula
[¦da·vǝ·sǝn `kal·bik ´fȯr·myǝ·lǝ]
ELECTRONICS
A formula which states that the focal length of a simple electrostatic lens consisting of a circular hole in a conducting plate is equal to four times the potential of the plate divided by the difference in the potential gradients on either side of the plate.
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