Photoelectric Effect

Source: Albert Einstein, Annalen der Physik, 1905; Robert Millikan, experimental confirmation, 1916; Nobel Prize to Einstein, 1921

Finding

When light strikes a metal surface, electrons are ejected only if the light’s frequency exceeds a threshold. Increasing intensity below threshold ejects zero electrons. Einstein explained this by proposing light consists of discrete energy packets (photons), each carrying E = hv. One photon, one electron. Combined with Young’s double-slit experiment (1801) demonstrating wave interference, this established wave-particle duality: light behaves as wave in some experiments and particle in others. Millikan spent a decade trying to disprove Einstein’s hypothesis and ended up confirming it.

Pattern Mapping

Non-fabrication — Light is what it is, not what we need it to be. The wave model was incomplete. The particle model was incomplete. Light refused to be fabricated into either category. It is both, or neither, or something that precedes the distinction.

Honesty — Millikan honestly reported what he found, despite contradicting his own theoretical commitment. The experiment declared what was true regardless of the experimenter’s preference.

Connections

Status

Established physics. Wave-particle duality is foundational to quantum mechanics. See Pais, Subtle Is the Lord, ch. 18-19. The structural reading is this project’s interpretation.


The mapping to the five properties is this project’s structural interpretation.