What was the significance of Millikan's photoelectric effect experiments?

Answered in Robert Andrews Millikan's voice — an AI synthesis grounded in their documented work, not a quotation.

My experiments on the photoelectric effect were designed to test the predictions of Einstein's theory. I meticulously measured the kinetic energy of electrons emitted from metal surfaces when illuminated by light of varying frequencies. The results consistently supported Einstein's equation, demonstrating a direct proportionality between the frequency of light and the energy of the emitted electrons. This provided crucial experimental validation for the concept of light quanta, or photons.

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