Thus Planck's description of the average resonator entropy became
Planck's Quantum Hypothesis - PowerPoint PPT …
The atom will be completely stable in the state with the smallestorbit, since there is no orbit of lower energy into which the electron canjump.Bohr's starting point was to realize that classical mechanics by itselfcould never explain the atom's stability.
Planck's quantum theory is compatible with the experimental data ..
Thus the remarkable conclusion is reached that the relation does not depend on the nature of the resonator, in particular, not upon its damping coefficient - a very gratifying and welcome circumstance to me, since it allowed the whole problem to be simplified in so far that the energy of radiation could be replaced by the energy of the resonator.
Planck’s Theory of Radiation | SpringerLink
In 1800 Friedrich William Herschel (1738 Nov 15 - 1822 Aug 25), the man who discovered Uranus, added another fact to Humanity's knowledge of light, another clue to the answer to the question.
discussion of Planck’s theory of radiation.
Bohr noticed,however, that the quantum constant formulated by the German physicist MaxPlanck has dimensions which, when combined with the mass and charge of theelectron, produce a measure of length.
Planck’s law and light quantum hypothesis - …
Physicists eventually came to call that special manifestation of light cavity (Hohlraum) radiation and then they found that they could give it another name when they discovered that it represents a fundamental problem in the physics of heat and light.
Consequences of Plancks hypothesis.
Fraunhofer passed a collimated beam of light through a narrow slit and then sent the light from the slit into a glass prism whose axis of symmetry ran parallel to the slit.