. The Bell System technical journal . Fig. 1 tracks observed in many thousand photographs with the same collision in air, in which the struck nucleus was not broken, butknocked to one side while the alpha-particle rebounded in the mannerdemanded by the principle of conservation of momentum, is shown. Fig. 2 in Fig. 3. These results show how small the atom-nuclei must be,compared to the extension of their electron-systems; for the 80,000alpha-particles observed in air had traversed the electron-systems ofabout ten billion molecules altogether. 1 As Rutherfords experiments indicate that a
. The Bell System technical journal . Fig. 1 tracks observed in many thousand photographs with the same collision in air, in which the struck nucleus was not broken, butknocked to one side while the alpha-particle rebounded in the mannerdemanded by the principle of conservation of momentum, is shown. Fig. 2 in Fig. 3. These results show how small the atom-nuclei must be,compared to the extension of their electron-systems; for the 80,000alpha-particles observed in air had traversed the electron-systems ofabout ten billion molecules altogether. 1 As Rutherfords experiments indicate that argon atoms are especially stableagainst disintegration, this may be a case of two consecutive collisions with adjacentatoms. SOME CONTEMPORARY ADVANCES IN PHYSICS 103 Fig. 4 shows curious collisions of alpha-particles passing throughhelium gas, photographed by D. Bose and S. Ghosh of Calcutta. Ineach of the two left-hand trails the alpha-particle has apparently
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
