The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1915 - English periodicals |
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Common terms and phrases
absorption alpha alpha rays aluminium approximately assumption axis band benzene bulb calculated carbon atoms centre charge coefficient collision colour components constant Coolidge tube corresponding curve deflexion determined direction displacement distance doublets effect electric force electrometer electrons emitted energy equal equation Ernest Rutherford excited expected experimental experiments expression filament formula frequency function galvanometer gases given gradients helium hydrogen increase intensity ionization J. J. Thomson lamp light lines maximum mean measurements mercury metal method molecule negative ion number of electrons observed obtained orbits paper particles Phil Phys plane plate polarization polonium positive pressure primary radiation radium ratio rays rotation secondary potential shown in fig shows spark spectra spectrum Stark effect surface Table temperature tetrahedron theory thickness tion tungsten uranium vapour velocity voltage volts watts wave-length Young's modulus zero zinc
Popular passages
Page 388 - In any atomic or molecular system consisting of positive nuclei and electrons in which the nuclei are at rest relative to each other, and the electrons move in circular orbits, the angular momentum of each electron round the centre of its orbit will be equal to A/2r in the 'normal' state of the system, ie, the state in which the total energy is a minimum.
Page 385 - According to this theory, the atoms consist of a positively charged nucleus surrounded by a system of electrons kept together by attractive forces from the nucleus: the total negative charge of the electrons is equal to the positive charge of the nucleus. Further, the nucleus is assumed to be the seat of the essential part of the mass of the atom, and to have linear dimensions exceedingly small compared with the linear dimensions of the whole atom.
Page 27 - ... convective movements do not occur. The conduction of heat operates very slowly in large dimensions, as I have already explained above. Radiation can only make itself felt to any considerable extent for those classes of rays that are strongly absorbed. On the other hand, experiments on the radiation from ice and observations of nocturnal frosts show that most rays of even such low temperatures can pass through thick layers of clear atmosphere without material absorption. Therefore a cold stratum...
Page 386 - E = hv, where h is Planck's constant ; (4) That the different stationary states of a simple system consisting of an electron rotating round a positive nucleus are determined by the condition that the ratio between the total energy, emitted during the formation of the configuration, and the frequency of revolution of the electron is an entire multiple of h/2ir.
Page 386 - ... (A) An atomic system possesses a number of states in which no emission of energy radiation takes place, even if the particles are in motion relative to each other, and such an emission is to be expected on ordinary electrodynamics. The states are denoted as "stationary" states of the system under consideration.
Page 507 - Consequently if a metal bar, along which a current is flowing, be placed in a magnetic field perpendicular to the direction of the current, the...
Page 386 - That the dynamical equilibrium of the systems in the stationary states is governed by the ordinary laws of mechanics, while these laws do not hold for the passing of the systems between the different stationary states.
Page 356 - The energy required to produce a pair of ions in air is consequently about 35 volts.
Page 681 - ... the hypothesis that a slight mechanical shock of any kind produces a periodic but rapidly extinguished paralysis of the perception of light, and that the nerves on which seeing depends cannot bear more than a certain amount of mechanical acceleration without loss of sensibility. This hypothesis of a momentary paralysis of the sense of vision seems unnecessary.
Page 706 - K2e f sin 0i sin 02~| where the sign is positive if the charges have the same sign, and negative if they are of opposite sign. As only the longitudinal component of the vector G is desired, only the transverse component of E is needed. Then H = uE sin <t>/c, where 0 = the angle between E and the direction of u.