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jun 4, 1879 - Albert Einstein
Description:
Used Planck's quantum theory to come up with the photoelectric effect, which states that light has enough energy when shined on a metal to force the electrons out of their energy levels and reflect out onto the metal.
Added to timeline:
20 Nov 2018
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Protons Timeline
Date:
jun 4, 1879
Now
~ 144 years ago
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