Perform the experiment that is one of the classic demonstrations of the quantization of atomic energy levels.
This version of our Frank-Hertz Apparatus is for users who already have power supplies and current amplifier. The full system, including power supplies and amplifier, is also offered: Frank-Hertz System (SE-9639).
https://www.pasco.com/products/lab-apparatus/fundamental-constants/se-9650#specs-panel
