Квант — разлика између измена

Енергија кванта (фотона) изражава се [[Планкова формула|Планковом формулом]].-->

 

 

Реч квант потиче од латинског quantum (множина quanta) = количина, мноштво, свота, износ, део.

Planck was reluctant to accept the new idea of quantization, as were many others. But, with no acceptable alternative, he continued to work with the idea, and found his efforts were well received. Eighteen years later, when he accepted the [[Nobel Prize in Physics]] for his contributions, he called it "a few weeks of the most strenuous work" of his life. During those few weeks, he even had to discard much of his own theoretical work from the preceding years. Quantization turned out to be the only way to describe the new, and detailed experiments which were just then being performed. He did this practically overnight, openly reporting his change of mind to his scientific colleagues, in the October, November, and December meetings of the [[German Physical Society]], in [[Berlin]], where the black body work was being intensely discussed. In this way, careful experimentalists (including [[F. Paschen]], [[O.R. Lummer]], [[Ernst Pringsheim]], [[Heinrich Rubens]], and [[F. Kurlbaum]]), and a reluctant theorist, ushered in a momentous scientific revolution.-->

 

Загрејано тело емитује топлотно зрачење (топлоту), дакле, [[електромагнетно зрачење]] у [[инфрацрвено зрачење|инфрацрвеном]] домену [[спектар (физичка хемија)|спектра]]. У то време све је то било добро познато. Ако се тело и даље загрева онда почиње знатније да емитује и видљиво зрачење, прво у црвеном делу спектра (црвено усијање) а после и у целом видљивом опсегу (бело усијање). Претходних година зрачење црног тела детаљно је испитивано за шта су развијени и одговарајући инструменти.