Periodic Table |
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| What is the Periodic Table Showing? | Periodicity |
The INTERNET Database of Periodic Tables
There are thousands of periodic tables in web space, but this is the only comprehensive database of periodic tables & periodic system formulations. If you know of an interesting periodic table that is missing, please contact the database curator: Mark R. Leach Ph.D. The database holds information on periodic tables, the discovery of the elements, the elucidation of atomic weights and the discovery of atomic structure (and much, much more).
| Year: 1900 | PT id = 1367, Type = structure |
Planck and E = hν
Planck, M. Über das Gesetz der Energieverteilung im Normalspektrum (On the law of energy distribution in the normal spectrum). Annalen der Physik, 4, 553–563 (1901). (Presented to the German Physical Society in Dec 1900).
"In 1894, Planck turned his attention to the problem of black-body radiation which had been stated by Kirchhoff in 1859 as: 'How does the intensity of the electromagnetic radiation emitted by a black body (a perfect absorber, also known as a cavity radiator) depend on the frequency of the radiation (i.e., the colour of the light) and the temperature of the body?'
The central assumption of Planck’s new analysis, the Planck postulate, was that electromagnetic energy could be emitted only in quantized form; in other words, the energy could only be a multiple of an elementary unit:
E = hν
Where h is the Planck constant, also known as Planck's action quantum and ν (the Greek letter 'nu') is the frequency of the radiation."
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| What is the Periodic Table Showing? | Periodicity |
© Mark R. Leach Ph.D. 1999 –
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