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Photoelectric Threshold Frequency Law

Einstein explained that photoelectron emission requires incident light above a material-dependent threshold frequency, regardless of how intense lower-frequency illumination becomes.

Albert Einstein photographed in Princeton in 1947
Albert Einstein, Princeton, 1947. Photograph by Oren Jack Turner; Library of Congress image with no known restrictions. Wikimedia Commons source.
Read the explainer →Year 1905BernPhysics

Photoelectric Threshold Frequency Law

1905 · Bern · Switzerland · Physics

Einstein explained that photoelectron emission requires incident light above a material-dependent threshold frequency, regardless of how intense lower-frequency illumination becomes.

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