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Frank - Hertz Experiments

— experiments, which could prove the existence of discrete energy levels of electrons in atoms. F.-H. e. have shown that the collision of electrons with atoms of the past are able to perceive only a certain amount of energy and therefore produce electromagnetic radiation of certain frequencies. Delivered in $1913$, it. physicists John. Frank $(1882 - 1964)$ and H. Hertz $(1887 - 1976)$.