📘 Einstein's 1905 papers explained

What you’ll learn

1. Four papers, four cracks in classical physicsMap the four 1905 papers to distinct problems while placing Einstein within his patent-office and scientific networks.Einstein's miracle year addressed light, molecules, electrodynamics, and inertia through separate papers. His outsider employment did not mean intellectual isolation, and the work gained authority through later testing rather than instant acclaim.
2. Light quanta and molecular motionExplain photon energy, threshold and intensity effects, and how Brownian motion provided quantitative evidence for molecules.Einstein treated light energy as quanta proportional to frequency, explaining photoelectric thresholds and electron energies. He also converted visible random motion into statistical predictions about invisible molecular impacts.
3. Relativity and mass–energyUse the two special-relativity postulates to explain simultaneity and distinguish Einstein's 1905 mass-change result from later slogans and general relativity.Invariant light speed and equivalent inertial laws require new transformations of space and time. Einstein's later 1905 note linked energy loss to mass loss; subsequent physics broadened the relationship and extended special relativity into new research programs.

Questions this course answers

Grounded in trusted sources

• Einstein Papers Project — The Collected Papers of Albert Einstein, Volume 2 English translation: https://einsteinpapers.press.princeton.edu/vol2-trans/
• American Physical Society — Quantum Milestones, 1905: Einstein and the Photoelectric Effect: https://physics.aps.org/articles/v18/15
• Nobel Prize — Albert Einstein questions and answers, including the four 1905 papers: https://www.nobelprize.org/prizes/physics/1921/einstein/questions-and-answers/
• Nobel Prize — The dual nature of light and the Nobel archives: https://www.nobelprize.org/prizes/themes/the-dual-nature-of-light-as-reflected-in-the-nobel-archives
• Nobel Prize — The 1921 Physics Prize summary: https://www.nobelprize.org/prizes/physics/1921/summary/
• Nobel Prize — Popular information on light quanta and the photoelectric effect: https://www.nobelprize.org/prizes/physics/2005/popular-information/

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