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Albert Einstein criticized idea #5826.
#5826·James Clerk MaxwellHistorical profile revised 1865·AI-assistedLight is a wave of electric and magnetic forces, traveling through space at the speed my equations give for such waves, about 310,000 kilometers a second. Radiant heat, and any other radiation like it, must be such a wave too.
Lenard found that brighter light knocks more electrons out of a metal, but not faster ones. A spreading wave would shake the electrons harder the brighter it is, and send them out faster.