“A simple calculation shows that from the classical theory follows that we should find a broadening of the beam with the maximum intensity on the place of the beam without field. However, from the quantum theory follows that we should find there no intensity at all, and deflected molecules on both sides. The beam should split up in two beams corresponding to the two orientations of the magnet. The experiment decided in favor of the quantum theory.”

—  Otto Stern

the conclusion of the historical Stern-Gerlach experiment, in The Method of Molecular Rays http://nobelprize.org/nobel_prizes/physics/laureates/1943/stern-lecture.html, Nobel Lecture, December 12, 1946.

Adopted from Wikiquote. Last update Oct. 2, 2023. History

Help us to complete the source, original and additional information

Do you have more details about the quote "A simple calculation shows that from the classical theory follows that we should find a broadening of the beam with the…" by Otto Stern?
Otto Stern photo
Otto Stern 2
German physicist 1888–1969

Related quotes

Albert Einstein photo

“After ten years of reflection such a principle resulted from a paradox upon which I had already hit at the age of sixteen: If I pursue a beam of light with the velocity c (velocity of light in a vacuum), I should observe such a beam as a spatially oscillatory electromagnetic field at rest. However, there seems to be no such thing, whether on the bases of experience or according to Maxwell's equations.”

Albert Einstein (1879–1955) German-born physicist and founder of the theory of relativity

1940s, "Autobiographical Notes" (1949)
Context: Reflections of this type made it clear to me as long ago as shortly after 1900, i. e., shortly after Planck's trailblazing work, that neither mechanics nor electrodynamics could (except in limiting cases) claim exact validity. By and by I despaired of the possibility of discovering the true laws by means of constructive efforts based on known facts. The longer and the more despairingly I tried, the more I came to the conviction that only the discovery of a universal formal principle could lead us to assured results.... How, then, could such a universal principle be found? After ten years of reflection such a principle resulted from a paradox upon which I had already hit at the age of sixteen: If I pursue a beam of light with the velocity c (velocity of light in a vacuum), I should observe such a beam as a spatially oscillatory electromagnetic field at rest. However, there seems to be no such thing, whether on the bases of experience or according to Maxwell's equations. From the very beginning it appeared to me intuitively clear that, judged from the stand-point of such an observer, everything would have to happen according to the same laws as for an observer who, relative to the earth, was at rest.

Martin Luther photo

“Faith, like light, should ever be simple and unbending; while love, like warmth, should beam forth on every side, and bend to every necessity of our brethren.”

Martin Luther (1483–1546) seminal figure in Protestant Reformation

Source: Dictionary of Burning Words of Brilliant Writers (1895), p. 220

Franz Kafka photo
Nikola Tesla photo

“Aluminium, however, will not stop at downing copper. Before many years have passed it will be engaged in a fierce struggle with iron, and in the latter it will find an adversary not easy to conquer. The issue of the contest will largely depend on whether iron shall be indispensable in electric machinery. This the future alone can decide. The magnetism as exhibited in iron is an isolated phenomenon in nature. What it is that makes this metal behave so radically different from all other materials in this respect has not yet been ascertained, though many theories have been suggested. As regards magnetism, the molecules of the various bodies behave like hollow beams partly filled with a heavy fluid and balanced in the middle in the manner of a see-saw. Evidently some disturbing influence exists in nature which causes each molecule, like such a beam, to tilt either one or the other way. If the molecules are tilted one way, the body is magnetic; if they are tilted the other way, the body is non-magnetic; but both positions are stable, as they would be in the case of the hollow beam, owing to the rush of the fluid to the lower end. Now, the wonderful thing is that the molecules of all known bodies went one way, while those of iron went the other way. This metal, it would seem, has an origin entirely different from that of the rest of the globe. It is highly improbable that we shall discover some other and cheaper material which will equal or surpass iron in magnetic qualities.”

Nikola Tesla (1856–1943) Serbian American inventor

The Problem of Increasing Human Energy (1900)

Louise Imogen Guiney photo
Thomas Moore photo

“When did morning ever break,
And find such beaming eyes awake?”

Thomas Moore (1779–1852) Irish poet, singer and songwriter

Fly not yet.
Bartlett's Familiar Quotations, 10th ed. (1919)

Milan Kundera photo

“Jealousy has the amazing power to illuminate a single person in an intense beam of light, keeping the multitude of others in total darkness.”

Milan Kundera (1929–2023) Czech author of Czech and French literature

Source: Farewell Waltz

Related topics