decrease velocity swiftly moving electrified de bohr niels (5 résultats)

(22 x 14,5 cm). VIII, 824 S. Mit Abbildungen und 18 teils gefalteten Tafeln. Halbleinwandband der Zeit. Erste Ausgabe. - Bohr beschreibt hier die Kathodenstrahlexperimente von Franck und Hertz mit Hilfe seiner Theorie, besonders den Übergang vom Normalzustand des Atoms in einen anderen stationären Zustand. "Die berühmten Stoßexperimente von Franck und Hertz wurden von Bohr sofort als Bestätigung der Existenz diskreter Energieniveaus aufgefaßt" (Röseberg, Bohr). - Stempel auf Titel. Einband gering berieben, sonst sauber und gut erhalten. - DSB 2, 239; Röseberg, Bohr Nr. 16 und 17. - Der Band enthält weiter Arbeiten von J. J. Thomson, Rayleigh, Bragg, Rutherford, Soddy etc.

Soft cover. Etat : Good. Niels BOHR. "On the Decrease of Velocity of Swiftly Moving Electrified Particle in passing through matter" in Philosophical Review, London, Taylor and Francis, sixth series, October 1915; this is the full monthly issue, with the Bohr on pp 581-612 in the issue of pp 549-664. This is offered without wrappers, extracted from a larger bound volume.

Soft cover. Etat : Good. 1st Edition. First edition, rare author's presentation offprint. "On the Decrease of Velocity of Swiftly Moving Electrified Particles in Passing Through Matter" is the continuation of Bohr's important work on the behavior of alpha particles passing through a material medium. In an earlier 1913 paper ("On the Theory of the Decrease of Velocity of Moving Electrified Particles on Passing Through Matter") Bohr studied the energy loss of alpha particles through ionization and was able to "express the rate of energy loss in terms of the velocity by a much more accurate formula than had so far been achieved - a formula, in fact, to which modern quantum mechanics adds only nonessential refinements" (DSB). In this 1915 follow-up paper, Bohr "includes the influence of effects due to relativity and to straggling (that is, the fluctuations in energy and in range of individual particles)" (Pais, Niels Bohr's Times, p. 128). 8vo, pp. 581-612. Original printed wrappers (dust-soiled at edges, upper outer corner of front wrapper broken off and reinstated, glue residue at spine).

In: The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. Series 6 Vol. 30 = July-December 1915, No. 177, pp. 394-415; No. 178, pp. 581-612. Bound in half leather with gilt-stamped title on spine. Edges rubbed and spine slightly torn. Library stamps from Wilhelm von Siemens on title page and endpaper. Edges, endpaper, title page and some plate margins are brown-spotted. Poggendorff V, 139. - The complete Volume includes 18 plates, VII, 824 pp.- In this Volume are also included the following First Editions of: THOMSON, J.J., Conduction of Electricity through Metals. No. 175, pp. 192-202. Poggendorff V, 1254; THOMSON, J.J., The Mobility of Negative Ions at Low Pressures. No. 177, pp. 321-328; THOMSON, J.J., A Method of Finding the Coefficients of Absorption of the Different Constituents of a Beam of Heterogeneous Röntgen Rays, or the Periods and Coefficients of Damping of a Vibrating Dynamical System. No. 180, pp. 780-783. RUTHERFORD, E., J. BARNES and H. RICHARDSON, Maximum Frequency of the X Rays from a Coolidge Tube for Different Voltages. No. 177, pp. 339-360; RUTHERFORRD, E. and J. BARNES, Efficiency of Production of X Rays from a Coolidge Tube. No. 177, pp. 361-367. Poggendorff V, 1083. RICHARDSON, O.W., Metallic Conduction. No. 176, pp. 295-299. Poggendorff V, 1046. Sprache: Englisch.

London, Taylor & Francis, 1915. Contemp. hcalf. Spine gilt, title- and tomelabels with gilt lettering. Spine a bit rubbed, some cracking to hinges, but covers not detached. In: "The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science", Vol. XXX, Sixth Series. VIII,824 pp., textillustr. and 18 plates. (Entire volume offered). Bohr's papers: pp. 394-413 and pp. 581-612. A stamp to verso of titlepage. Internally clean and fine. First appearance of a landmark paper in which Bohr found experimental support for his energy equation for electron orbits and of stationary states in the work of Franck and Hertz from 1914. Furthermore, Franck and Hertz unwittingly provided an independent confirmation of the concept of stationary state. In 1914 they observed an energy threshold in the electron-stopping power of mercury vapor. This threshold, Bohr explained the following year, corresponded to a transition between the normal state and another (first excited) stationary state of the mercury atom (and not, as Franck and Hertz had originally thought, to the ionization of the atom). The supramechanical stability implied by the assumption of stationary states was now empirically proved to comprehend stability with regard to electron impacts."Bohr had to frequently revise and refine his atomic model in light of new discoveries. One significant paper "On the Quantum Theory of Radiation and the Structure of the Atom," (the paper offered) added more specific details about atomic states. For example Bohr had earlier made the argument that electrons could jump from one orbit to another as energy was emitted or absorbed. In this paper, he theorezed that an atom possesses stationary states in which energy was neither emitted nor absorbed. Any emission or absorption that did occur, such as might induce an electron ump, would correspond to the transition between two stationary states."(sparknotes.com).An: the second paper offered. When Bohr had finished his importent paper on the hydrogen atom "On the Theory of Decrease of Velocity of Moving Electrified Particles on passing through Matter" 1913, he completed another paper on that subject (the paper offered), which includes the influence of effects due to relativity and to straggling (that is, the fluctuations in energy and in range of individual particles).(Pais p. 128).Rosenfeld no 13 a. 14.The volume contains further importent papers by J.J. THOMSON, W.H. BRAGG, RUTHERFORD & BARNES, SODDY & HITCHINS etc.