Franck Hertz expiriment (maybe you know?)

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costa nadav
Franck Hertz expiriment (maybe you know??)

in experiment i performed of Franck H I got that the maxima interval are becoming larger as the temprature grows.
This is not as it should be by the theore
Can anyone answer that
?
 
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Perhaps a small explanation of the experiment could help generating more repons. I, for one, am not in the mood to search the web for F. Hertz experiments...
 
I did a google and here's the description. It got the Nobel Prize. Franck-Herz experiment
 

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