
 The Quantacized Atom 
  The energy is then emitted as a photon, a quantum of electromagnetic radiation, as explained by Albert Einstein in 1905 (the "photoelectric effect"), at a frequency and wavelength proportional to its energy, according to Planck's equation, E = 
  When electrons drop down to the lowest quantum level, where angular momentum is zero, they emit photons in the ultraviolet part of the electromagnetic spectrum. 
  The "Planck" units are of significance (1) as "natural" units of measurement, based on the Planck Constant, the velocity of light, and the Gravitational Constant (with Boltzmann's Constant used to convert the Planck Energy into the Planck Temperature), and (2) for the recent and promising physics of Strings and SuperStrings. 
 www.friesian.com /quanta.htm (5341 words) 
