The London, Edinburgh and Dublin Philosophical Magazine and Journal of ScienceTaylor & Francis, 1919 - Physics |
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Common terms and phrases
absorption coefficient æther amplitude angle aperture assumption atomic number axis boundary C₁ calculated centre circuit collision components constant corresponding curve cylinder damping deflexion density determined diffraction distance effect electric elements energy equal equation experimental experiments expression field force formula frequency give given H atoms hydrogen increase integral intensity ionization ionization potential J. J. Thomson L-systems light Lord Rayleigh luminosity magnetic magnetic field maxima and minima maximum method minima molecules motion nucleus number of electrons number of H number of scintillations observed obtained oscillations paper particles peak potential Phil plane plate positive pressure primary quadratic form quant-number radiation radium radius range rays recombination reflexion resonance potential ring screen secondary shaft speed surface Table temperature thallium theory tube values vapour velocity vibrations volts wave-length zero
Popular passages
Page 322 - A man starts from a point 0 and walks I yards in a straight line ; he then turns through any angle whatever and walks another I yards in a second straight line. He repeats this process n times. I require the probability that after these n stretches he is at a distance between r and r + dr from his starting point 0.
Page 106 - ... interference, that is, to cavities or strata of different optical properties, compression would alter the spacing of these, and thus give rise either to different colours or, with more than a very slight compression, to the transmission and reflexion of white light. " In every experiment of this kind which I have made either on feathers or insect scales the effect of pressure has been to destroy the colour altogether " With many feathers the colour returns when the pressure is taken off, but...
Page 566 - ... cm. Such a conclusion is to be anticipated on general grounds, for presumably the oxygen nucleus is more complex and has larger dimensions than that of helium. In his preliminary experiments Marsden observed that the active source always gives rise to a number of scintillations on a zinc sulphide screen far beyond the range of the a-particle. I have always found these natural scintillations present in the sources of radiation employed.
Page 106 - I have made either on feathers or insect scales the effect of pressure has been to destroy the colour altogether. . . . With many feathers the colour returns when the pressure is taken off, but with insect scales the structure seems to be permanently injured by compression, and though when allowed to expand again the material is not colourless, the brilliancy which belonged to the uninjured scale is gone, and the colour in general changed.
Page 100 - In the case of the substances at present considered, the reflected light does not vanish, but at a considerable angle of incidence the pencil polarized perpendicularly to the plane of incidence becomes usually of a richer colour, in consequence of the removal, in a great measure, of that portion of the reflected light which is independent of the metallic properties of the medium ; it commonly becomes, also, more strictly related to that light which is absorbed with such great intensity.
Page 475 - ... plane of polarization of the wave is perpendicular to this axis; the corresponding ray is parallel to the line of intersection of the tangent plane at the end of the axis and the plane containing the axis and the wave-normal; the ray-velocity is the reciprocal of the length of the perpendicular from the centre on the tangent plane. By reciprocating with respect to a sphere of unit radius concentric with the ellipsoid, we obtain a similar proposition in which the ray takes the place of the wave-normal,...
Page 126 - The work was carried out in the laboratory of the Indian Association for the Cultivation of Science. The writer wishes to acknowledge the interest taken in this investigation by Prof.
Page 106 - The transparency or, at any rate, the vanishing of the characteristic transmitted colour in the case of all animal tissues when immersed and permeated by a fluid of the same refractive index is strongly in favour of interference being the source of the colour, but even stronger evidence is given by the behaviour of the structures under mechanical pressure. " If the grain or peculiarities which favour the...
Page 571 - ... mm. apart, and the number of scintillations on the screen placed near the end of the plates was observed for different strengths of the magnetic field. Under these conditions, when the scintillations arise from the whole length of the column of air between the plates, the strongest...
Page 571 - As far as the experiment goes, this is an indication that the scintillations are due to H atoms; but the actual number of scintillations and the amount of reduction was too small to place much reliance on the result. In order to settle this question definitely, it will probably prove necessary to employ a solid nitrogen compound, free from hydrogen, as a source. and to use much stronger sources of a rays. In such experiments, it will be of importance to discriminate between the deflexions due to...