Franck-Hertz experiment have been done by using equipment of Franck-Hertz experiment in the laboratory of experimentphysics. Intention of this attempt are comprehend the Franck-Hertz curve and comprehend the transfer energy which not ‘continue’ from free electron to atom mercury (raksa). In this experiment, the accelaration voltage U₂ is increased from 0 up to 32 volt while the voltage regulator U₁ and the decleration voltage U₃ are 1,5 volt and 3 volt. The result of E_Hg is E_Hg = 7 eV and E_Hg = 0,15 eV.

Keyword : atom excitation, absorbtion of energy, Franck-Hertz curve

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