Frases de Joseph John Thomson

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Joseph John Thomson

Fecha de nacimiento: 18. Diciembre 1856
Fecha de muerte: 30. Agosto 1940

Joseph John "J.J." Thomson, fue un científico británico, descubridor del electrón, de los isótopos e inventor del espectrómetro de masa. En 1906 fue galardonado con el Premio Nobel de Física.

Frases Joseph John Thomson

„Las dificultades que tendrían que ser superadas para hacer varios de los anteriores experimentos concluyentes son tan grandes como para ser casi insuperables.“

—  Joseph John Thomson
Advertencia sobre la no concluyente base experimental de la teoría electrostática, en una nota de la tercera edición de: [James Clerk Maxwell, Tratado sobre electricidad y magnetismo, Vol.1, 3ª edición, Oxford University Press, 1891, 37]

„Las dificultades que tendrían que ser superadas para hacer varios de los anteriores experimentos concluyentes son tan grandes como para ser casi insuperables.“

—  Joseph John Thomson
Nota: Advertencia sobre la no concluyente base experimental de la teoría electrostática, en una nota de la tercera edición de: [James Clerk Maxwell, Tratado sobre electricidad y magnetismo, Vol. 1, 3.ª edición, Oxford University Press, 1891, 37]

„I can see no escape from the conclusion that they are charges of negative electricity carried by particles of matter.“

—  J. J. Thomson
Quotes eat me, Context: As the cathode rays carry a charge of negative electricity, are deflected by an electrostatic force as if they were negatively electrified, and are acted on by a magnetic force in just the way in which this force would act on a negatively electrified body moving along the path of these rays, I can see no escape from the conclusion that they are charges of negative electricity carried by particles of matter. "Cathode rays" http://web.lemoyne.edu/~GIUNTA/thomson1897.html Philosophical Magazine, 44, 293 (1897).

„The difficulties which would have to be overcome to make several of the preceding experiments conclusive are so great as to be almost insurmountable.“

—  J. J. Thomson
Quotes eat me, Warning about the non-conclusiveness for the experimental foundation of electrostatic theory, in a footnote of the third edition of: [James Clerk Maxwell, A Treatise on Electricity and Magnetism, Vol.1, 3rd Edition, Oxford University Press, 1891, 37]

„We see from Lenard's table that a cathode ray can travel through air at atmospheric pressure a distance of about half a centimetre before the brightness of the phosphorescence falls to about half its original value. Now the mean free path of the molecules of air at this pressure is about 10-5 cm., and if a molecule of air were projected it would lose half its momentum in a space comparable with the mean free path. Even if we suppose that it is not the same molecule that is carried, the effect of the obliquity of the collisions would reduce the momentum to half in a short multiple of that path. Thus, from Lenard's experiments on the absorption of the rays outside the tube, it follows on the hypothesis that the cathode rays are charged particles moving with high velocities, that the size of the carriers must be small compared with the dimensions of ordinary atoms or molecules. The assumption of a state of matter more finely subdivided than the atom of an element is a somewhat startling one; but a hypothesis that would involve somewhat similar consequences—viz. that the so-called elements are compounds of some primordial element—has been put forward from time to time by various chemists.“

—  J. J. Thomson
Quotes eat me, Royal Institution Lecture (April 30, 1897) as quoted by Edmund Taylor Whittaker, A History of the Theories of Aether and Electricity from the Age of Descartes to the Close of the Nineteenth Century http://books.google.com/books?id=CGJDAAAAIAAJ (1910).

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„The electron: may it never be of any use to anybody!“

—  J. J. Thomson
Attributed, A popular toast or slogan at J. J. Thomson's Cavendish Laboratory in the first years of the 1900s, as quoted in Proceedings of the Royal Institution of Great Britain, Volume 35 (1951), p. 251.

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