By David L Anderson
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Additional info for Project Physics: Supplemental Unit B: Discoveries in Physics
Enter the electron In the two decades before Thomson's experiments of 1895 and 1896, other scientists had discovered that negative particles were emitted by metals in apparatus other than cathode ray tubes. Edison had found that white-hot metals, such as incandescent lamp filaments, gave off negatively charged particles. Hertz had discovered, while showing that Maxwell's electromagnetic waves were emitted by accelerating electric charges, that light could knock negatively charged particles out of certain metals.
1-20. 7 cms) for the small planet S. The two circles represent the initial orbits of the two planets. From the 'sun' draw a straight line to intersect the orbits of the two planets as shown in Fig. 1-20. 4 Sun Fig. Along the 1-20 orbit of the large planet, from the point of intersection step off the positions of the large planet at 60-day intervals. Similarly locate unperturbed positions at 60-day intervals along the orbit of the small planet. These are the positions at which it would have been if there had been no perturbation by the large planet.
Zeeman found that the spectral lines were slightly broader when the magnetic field was turned on than when it was off. With better spectroscopes of higher resolving power, both Zeeman and Crookes found that the apparent broadening of the gas, at lines was really a spUtting of the lines into doublets (close pairs) or and were polarized. Zeeman and another Dutch physicist, triplets Lorentz, soon worked out a theory to explain this that atoms emit hght by having a certain eff'ect. If one assumes means of oscillations of charged particles ratio of charge to mass, then the theory predicts that in the presence of a strong magnetic field the wavelengths of the emitted polarized hght are shifted in such a way as to show the observed sphtting of the lines.
Project Physics: Supplemental Unit B: Discoveries in Physics by David L Anderson