CATASTROFE ULTRAVIOLETTA PDF

Nel Paul Ehrenfest coniò il termine “catastrofe ultravioletta” per indicare una situazione anomala che, pur essendo prevista dalla fisica classica, non veniva. ptwiki Catástrofe do ultravioleta; ruwiki Ультрафиолетовая катастрофа; simplewiki Ultraviolet catastrophe; skwiki Ultrafialová katastrofa; svwiki Ultravioletta. Kundalini – Catastrofe Ultravioletta [Negazione I] | Listen and download the track, support the artist on Jamendo Music. Free music downloads.

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In classical physics, a radiator of energy will act as a natural vibrator. Albert Einstein and Satyendra Nath Bose solved the problem by postulating that Planck’s quanta were real physical particles — what we now call photonsnot just a mathematical fiction.

A History of the Sciences. In particular, Planck assumed that electromagnetic radiation can be emitted or absorbed only in discrete packets, called quanta, of energy: Questi risultati classici sono ben verificati sperimentalmente solo a temperatura ambiente.

Foundational quantum physics Physical paradoxes Physical phenomena. By calculating the total amount of radiated energy i. Per un gas biatomico: Retrieved from ” https: Max Planck derived the correct form for the intensity spectral distribution function by making some strange for the time assumptions. April Learn how and when to remove this template message.

ultraviolet catastrophe – Wikidata

From Wikipedia, the free encyclopedia. This article includes a list of referencesbut its sources remain unclear because it has insufficient inline citations. Questo evento prese il nome di catastrofe ultravioletta dato che erano proprio questi il tipo di raggi che dovevano essere emessi dai corpi a temperature ordinarie i raggi UV, i catastrote X e i raggi gamma.

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Estratto da ” https: Planck’s assumptions led to the correct form of the spectral distribution functions: Einstein’s photon had an energy proportional to its frequency and also explained an unpublished law of Ultravioleetta and the photoelectric effect. Retrieved December 13, Menu di navigazione Strumenti personali Accesso non effettuato discussioni contributi registrati entra.

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Si consideravano i corpi composti da un numero enorme di oscillatori indipendenti con hamiltoniana del tipo: Infatti la legge prevede che gli oscillatori di lunghezza d’onda brevissima risultino fortemente eccitati anche a temperature ordinarie K.

Ad esempio, per una mole di gas monoatomico risulta: Vedi le condizioni d’uso per i dettagli. The phrase refers to the fact that the Rayleigh—Jeans law accurately predicts experimental results at radiative frequencies below 10 5 GHz, but begins to diverge with empirical observations as these frequencies reach the ultraviolet region of the electromagnetic spectrum.

Questa legge prevede che un corpo nero possa emettere radiazione con potenza infinita. For his services to Theoretical Physics, and especially for his discovery of the law of the photoelectric effect. Da Wikipedia, l’enciclopedia libera. This therefore implies that the radiated power per unit frequency should follow the Rayleigh—Jeans law, and be proportional to frequency squared. An example, from Mason’s A History of the Sciences[2] illustrates multi-mode vibration via a piece of string.

Einstein and the Quantum. Si consideravano i corpi composti da un numero enorme di oscillatori indipendenti con hamiltoniana del tipo:. They modified statistical mechanics in the style of Boltzmann to an ensemble of photons.

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And, since each mode will have the same energy, most of the energy in a natural vibrator will be in the smaller wavelengths and higher frequencies, where most of the modes are. Per un gas biatomico:.

By using this site, you agree to the Terms of Use and Privacy Policy. As a natural vibratorthe string will oscillate with specific modes the standing waves of a string in harmonic resonancedependent on the length of the string.

Views Read Edit View history. Thus, both the power at a given frequency and the total radiated power is unlimited as higher and higher frequencies are considered: Ad esempio, per una mole di gas monoatomico risulta:.

Categoria:Ultravioletto

Please help to improve this article by introducing more precise citations. The term “ultraviolet catastrophe” was first used in by Paul Ehrenfestbut the concept originated with the derivation of the Rayleigh—Jeans law.

This page uultravioletta last edited on 24 Octoberat Articles lacking in-text citations from April All articles lacking in-text citations. According to classical electromagnetism, the number catastrofw electromagnetic modes in a 3-dimensional cavity, per unit frequency, is proportional to the square of the frequency.