CHEM 14A Chapter Notes - Chapter 1A.1: Hans Geiger, Ernest Marsden, Electric Field
25 Oct 2020
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Obtained the first experimental evidence for the internal structure of atoms in. Cathode rays: the rays that are emitted when high potential difference is applied between two metal electrodes in an evacuated glass tube. Showed that they are streams of negatively charged electrode (cathode) Abled to measure the value of e/m e. Ratio of the magnitude of the electron"s charge e to its mass m. Carried out experiments that enabled him to determine the value of e. Designed an apparatus in which he could observe tiny electrically charged oil droplets. Determined the value of the charges on the particles from the strength of the electric field required to overcome the pull of gravity on the droplets. The modern value is e= 1. 602x10^-19 c. A charge of -e is considered to be one unit of negative charge. Fundamental charge: e is taken to be one unit of positive charge.
