Objective: Record and evaluate the Franck-Hertz curve for mercury
The Franck-Hertz experiment for mercury involves observing how energy is transferred from electrons as a result of inelastic collision while passing through mercury vapour. The transfer of energy occurs in discrete steps corresponding to the excitement by such collision of distinct energy level transitions in the mercury atoms. The experiment thus provides confirmation of the Bohr model of the atom and the discrete energy levels described by that model.
![Experiment: Franck-Hertz Experiment for Mercury (230 V, 50/60 Hz), 8000712 [UE5020300-230], Atomic shells](/imagelibrary/UE5020300-230/UE5020300-230_01_Experiment-Franck-Hertz-Experiment-for-Mercury-230-V-5060-Hz.jpg)
![Experiment: Franck-Hertz Experiment for Mercury (230 V, 50/60 Hz), 8000712 [UE5020300-230], Atomic shells](/thumblibrary/UE5020300-230/UE5020300-230_01_1200_1200_Experiment-Franck-Hertz-Experiment-for-Mercury-230-V-5060-Hz.jpg)
![Set of 15 Safety Experiment Leads, 75 cm, 1002843 [U138021], Circuits](/thumblibrary/U138021/U138021_01_140_140_Set-of-15-Safety-Experiment-Leads-75-cm.jpg)
![Digital Oscilloscope, 2x30 MHz, 1020910 [U11834], Oscilloscopes](/thumblibrary/U11834/U11834_01_140_140_Digital-Oscilloscope-2x30-MHz.jpg)
![HF Patch Cord, 1m, 1002746 [U11255], Experiment Leads and Cables](/thumblibrary/U11255/U11255_01_140_140_HF-Patch-Cord-1m.jpg)
![HF Patch Cord, BNC/4 mm Plug, 1002748 [U11257], Experiment Leads and Cables](/thumblibrary/U11257/U11257_01_140_140_HF-Patch-Cord-BNC4-mm-Plug.jpg)
![Digital Multimeter P3340, 1002785 [U118091], Hand-held Digital Measuring Instruments](/thumblibrary/U118091/U118091_01_140_140_Digital-Multimeter-P3340.jpg)
![Premium Franck-Hertz Experiment Power Supply (230 V, 50/60 Hz), 1012819 [U8482530-230], Franck-Hertz Experiment](/thumblibrary/U8482530-230/U8482530-230_01_140_140_Premium-Franck-Hertz-Experiment-Power-Supply-230-V-5060-Hz.jpg)
![Digital Multimeter P1035, 1002781 [U11806], Hand-held Digital Measuring Instruments](/thumblibrary/U11806/U11806_01_140_140_Digital-Multimeter-P1035.jpg)
![Barrel Foot, 1 kg, 1002834 [U13265], Bases](/thumblibrary/U13265/U13265_01_140_140_Barrel-Foot-1-kg.jpg)
![Tube Holder S, 1014525 [U185002], Electron Tubes S](/thumblibrary/U185002/U185002_01_140_140_Tube-Holder-S.jpg)
![High Voltage Power Supply 5 kV (230 V, 50/60 Hz), 1003310 [U33010-230], Power Supplies](/thumblibrary/U33010-230/U33010-230_01_140_140_High-Voltage-Power-Supply-5-kV-230-V-5060-Hz.jpg)
![DC Power Supply 20 V, 5 A (230 V, 50/60 Hz), 1003312 [U33020-230], Power Supplies](/thumblibrary/U33020-230/U33020-230_01_140_140_DC-Power-Supply-20-V-5-A-230-V-5060-Hz.jpg)
![Helmholtz Coils S, 1000611 [U185051], Experiments with Electron Tubes](/thumblibrary/U185051/U185051_01_140_140_Helmholtz-Coils-S.jpg)
![Digital Spectrometer LD, 1018103 [U22028], Spectrophotometer](/thumblibrary/U22028/U22028_01_140_140_Digital-Spectrometer-LD.jpg)
![DC Power Supply 0-500 V (230 V, 50/60 Hz), 1003308 [U33000-230], Power Supplies](/thumblibrary/U33000-230/U33000-230_01_140_140_DC-Power-Supply-0-500-V-230-V-5060-Hz.jpg)
![Spectrum Tube Power Supply (230V, 50/60 Hz), 1000684 [U418001-230], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U418001-230/U418001-230_01_140_140_Spectrum-Tube-Power-Supply-230V-5060-Hz.jpg)
![Spectrum Tube Hydrogen, 1003409 [U41817], Spectrum Tubes and Spectrum Lamps](/thumblibrary/U41817/U41817_01_140_140_Spectrum-Tube-Hydrogen.jpg)
![Teslameter E, 1008537 [U8533982], Magnetic Fields](/thumblibrary/U8533982/U8533982_01_140_140_Teslameter-E.jpg)
![Measurement Amplifier U (230 V, 50/60 Hz), 1020742 [U8557560-230], Measuring Amplifier](/thumblibrary/U8557560-230/U8557560-230_01_140_140_Measurement-Amplifier-U-230-V-5060-Hz.jpg)
![Experiment: Line Spectra (230 V, 50/60 Hz), Basic equipment, 8000706 [UE5020100-230], Atomic shells](/thumblibrary/UE5020100-230/UE5020100-230_01_140_140_Experiment-Line-Spectra-230-V-5060-Hz-Basic-equipment.jpg)