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h 'quantizza' l'energia, quindi l'energia non è una grandezza continua, ma discreta (quantizzata) che assume quindi (precisi) valori detti discreti, solo multipli della costante di Planck, h.
h (= Planck's Costant) = 6,62607025 • 10^-34 J•Hz^-1 = 4,14 • 10^-15 eV•s
4,14: 14 aprile, WQD
April 14th: World Quantum Day
Physics has definitely a sense of humor!
This day is celebrated every year on April 14th. In the US date format, it’s written as 4/14 which just happens to be the first three digits of the Planck constant (h) 4.14 × 10⁻¹⁵ eV·s T
This number was introduced by the German physicist Max Planck back in 1900
The event started in 2021, launched by an international group of scientists (who else?) And the goal is to help everyone understand what quantum science and technology are all about
So, in the spirit of quantum physics, I can officially say that right now... I am both sleeping and writing this post at the same time
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“When you change the way you look at things, the things you look at change.”
~ Max Planck

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As a man who has devoted his whole life to the most clear headed science, to the study of matter, I can tell you as a result of my research about atoms this much: There is no matter as such. All matter originates and exists only by virtue of a force which brings the particle of an atom to vibration and holds this most minute solar system of the atom together. We must assume behind this force the existence of a conscious and intelligent mind. This mind is the matrix of all matter.
Max Planck
Incredibile trovarci a "fare i conti" con quanto disse un certo Max Planck, proprio a casa nostra (durante un convegno a Firenze) nel lontano 1944!
Sono concetti forti: la materia come tale non esiste sarebbe l'ultima cosa che ci verrebbe da pensare. O magari accetteremmo la frase da un santone o un mistico, insomma uno che pensiamo non sia tanto "con i piedi per terra". Invece un fisico come Planck allo studio della materia ci ha dedicato tutta una vita, e dunque - se non altro per il ruolo che ha rivestito nella scienza moderna - va ascoltato con grande attenzione.
Ancora più esplosiva la seconda parte della citazione, sull'esistenza di una Mente cosciente ed intelligente, che sarebbe la matrice di tutta la materia.
Qui alcuni prenderebbero le distanze. Eppure dobbiamo scegliere, se i fisici vanno ascoltati, bisogna farlo anche quando dicono cose che ci sorprendono, che non rientrano nei nostri schemi mentali consueti.
Se non dobbiamo ascoltarli, bisognerà comunque capire a chi rivolgersi per avere indicazioni affidabili (diremmo, falsificabili) sulla natura del mondo fisico. Per la struttura intima del mondo al quale apparteniamo, che desideriamo realmente poter comprendere.