Abstract
A previous paper by the writer described some measurements of the scattering of cathode rays by thin metal foils. The observations were made under single scattering conditions, and it was concluded that they were in good quantitative agreement with the theory of single scattering due to Rutherford, modified to take account of the alteration in the mass of the particle with its velocity. Such a modification of the orbit of an electron in the field of an atomic nucleus was first suggested by C. G. Darwin, and it was used in this case to derive a “relativity” correction to the original α-ray scattering formula. The purpose of this paper is to show that the form of the correction used was not really applicable to these particular experiments, to derive a more complete correction, and to make a fresh comparison of the measurements with theory, though it will be shown that this comparison can only be approximate.
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