One of his most important contributions was the experimental realization of the photoelectric effect.
He discovered that the energy (speed) of the electrons ejected from a cathode depends only on the wavelength, and not the intensity of, the incident light.
Lenard was a nationalist and anti-Semite; as an active proponent of the Nazi ideology, he supported Adolf Hitler in the 1920s and was an important role model for the "Deutsche Physik" movement during the Nazi period.
Notably, he labeled Albert Einstein's contributions to science as "Jewish physics".
Author: Not mentioned in any source Source: Encyclopaedia Britannica. Original source AIP Emilio Segrè Visual Archives, American Institute of Physics. License:
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