McGraw Hill
Mc Graw Hill Companies: Origins of the Quantum Theory
An indexing page for Chapter 27 (Origins of the Quantum Theory) of the companion web site for McGraw Hill's Contemporary College Physics textbook. Includes several worthy pages with chapter notes, simple definitions, online computer...
University of Colorado
University of Colorado: Physics 2000: Planck's Constant and the Energy of a Photon
From the Physics 2000 web site. Planck's theory of quantized energy levels is explained. The concept of a photon is discussed and related to Planck's theory. Explanations are insightful and written in an easy to understand language which...