Update vol-I-chap-2-sect-1.md

modphysnobel · Sep 24, 2024 · 26b6f0f · 26b6f0f
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 (Images taken from CC Wikimedia Commons.)
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 **Figure 2.3.** Photograph of a vacuum tube used for the experiment (a) and results obtained by Franck-Hertz showing the current I registered in the anode versus the grid voltage V (b).