# (1) Theorie der lichterzeugung und lichtabsorption; (2) Prinzip von der erhaltung der schwerpunktsbewegung und die tragheit der energiein. In Annalen der Physik 20 (1906)-- Two landmark papers.

Einstein, Albert (1879-1955). (1) Theorie der lichterzeugung und lichtabsorption. In *Annalen der Physik* 20 (6): 199-206 pp. (2) Prinzip von der erhaltung der schwerpunktsbewegung und die tragheit der energiein. In *Annalen der Physik* 20 (8): 627-633 pp. Leipzig: Johann Ambrosius Barth, 1906. Red cloth, gilt lettering on spine. (214 x 140 mm). Frontis with portrait of Paul Drude tipped in. [Whole volume: viii, iv, 1048 pp. Figs. Text-illust. 6 plates (b/w silver photographs)]. Very good.

"On the Theory of Light Production and Light Absorption" **[no. 1, above]**. This classic in the history of physics is Einstein's second paper on the photoelectric effect. Einstein reconciled his and Planck's independent derivations of the blackbody formula E = h . Planck's derivation of this formula ascribed it to a restriction on the energy changes possible when radiation is produced or absorbed by matter, which implied no restriction on the energies of either matter or radiation. Einstein's 1905 derivation ascribed it to a restriction on the energy of radiation alone, but in this paper, he proposes the modern idea that the energies of both matter and radiation are quantized, which led to his work on quantum specifics.

[AND]

"The Principle of Conservation of Motion of the Center of Gravity and the Inertia of Energy"

**[no. 2, above].**In this "ingenious thought experiment involving energy transport in a hollow cylinder, Einstein returned to the relationship between inertial mass and energy, giving more general arguments for their complete equivalence" (Calaprice, The Einstein Almanac). This is the first statement that the conservation of mass is a special case of the conservation of energy.

Weil's Einstein Bibliography nos. 12, 13.

Boni's Einstein Checklist, nos. 12, 13.

Paul Ludwig Drude (1863-1906) was a German physicist specializing in optics. He wrote a fundamental textbook integrating optics with Maxwell's theories of electromagnetism entitled *Lehrbuch der Optik.* Drude is responsible for introducing the symbol ** c** for the speed of light in a perfect vacuum. (Wikipedia).

**Book Id:**50414

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