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Hz~ 1 . 73 K. D'apres J. Rich, Principes de la cosmologie. Editions de 1'Ecole Polytechnique, Palaiseau (2002). 19) possede une interpretation physique particulierement importante : la raison pour laquelle 1'energie d'une onde stationnaire de frequence u> est un multiple entier nhu de hu est que Ton y trouve precisement n photons (ou particules de lumiere) d'energie HLJ. C'est cette interpretation qui a conduit Einstein a introduire le concept de photon pour expliquer Veffet photoelectrique. Lorsqu'un metal est illumine par un rayonnement electromagnetique, des electrons sont arraches au metal, avec un effet de seuil qui depend de la frequence, et non de 1'intensite.

La procedure de renormalisation, qui elimine les infinis, permet de choisir une echelle d'energie ou de distance) arbitraire pour definir a. En resume, a depend de 1'echelle d'energie :aracteristique du processus etudie, et aussi du detail de la procedure de renormalisation cf. note 13). Cette dependance en energie de a est visible depuis quelques annees dans les jxperiences de precision de la physique des hautes energies. 3. 42) montrent qu'unites naturelles et unites atomiques sont reliees par des puissances de a.

14, celle d'un "puits de potentiel » : elle tend vers une meme constante pour x —> . II sera commode de fixer le zero d'energie de telle sorte que E = 0 pour une particule d'energie cinetique nulle a 1'infini. Deux situations sont possibles (i) La particule possede une energie E > 0 ; alors, si elle part par exemple de x = — oo, elle est d'abord acceleree puis freinee au passage du puits de potentiel et elle rejoint x = +00 avec une vitesse finale egale a sa vitesse initiale. On dit que la particule est dans un etat de diffusion.

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