what did franck hertz experiment prove

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1. Franck-Hertz Experiment

   

2. Franck Hertz Experiment Using Mercury or Neon

   

3. Franck Hertz Experiment Using Mercury or Neon

   

4. Franck-hertz experiment with mercury

   

5. The Franck-Hertz Experiment

   

6. Franck Hertz Experiment