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9 godz. temu · From the values of \(e/m\) and velocity for the \(\alpha\) particle […], it can easily be calculated that the change of direction of 2° in the direction of motion of some of the \(\alpha\) particles in passing through the thickness of mica (0.003 cm.) would require over that distance an average transverse electric field of about 100 million ...
9 godz. temu · As Footnote 1 we have seen in Sect. 3.7, in 1869 German chemist and physicist Johann Wilhelm Hittorf (Bonn, 1824–Münster, 1914) discovered that a green fluorescence was evident on the glass wall of a tube filled with a rarefied gas, inside which there were two electrodes between which a high potential difference was applied.Since the fluorescence appeared in front of the cathode, it was ...
9 godz. temu · One astronomical unit (about 150 million kilometres; 93 million miles) is defined as the mean distance between the centres of the Sun and the Earth. The instantaneous distance varies by about ± 2.5 million km or 1.55 million miles as Earth moves from perihelion on ~ January 3rd to aphelion on ~ July 4th.
