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Science Source ftp Apr 2015

EN_01170126_0283
Science Source ftp Apr 2015
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Robert Andrews Millikan (March 22, 1868 - December 19, 1953) was an American experimental physicist. His doctorate in physics from Columbia University in 1895 was the first awarded from that department. His love of education continued throughout his career, and he was the coauthor of a popular and influential series of introductory textbooks. Compared to other books of the time, they treated the subject more in the way in which it was thought about by physicists and included homework problems that asked conceptual questions. In 1908, while a professor at the University of Chicago, he began experiments in which he measured the charge on a single electron. He and his graduate student Harvey Fletcher used the oil-drop experiment to measure the charge of the electron (as well as the electron mass, and Avogadro's number, since their relation to the electron charge was known). Millikan took sole credit, in return for Fletcher claiming full authorship on a related result for his dissertation. Millikan went on to win the 1923 Nobel Prize for Physics, in part for this work, and Fletcher kept the agreement a secret until his death. Millikan is also credited with measuring the value of Planck's constant by using photoelectric emission graphs of various metals. He left the University of Chicago to become Caltech's chairman of the executive council (president). He served in that position from 1921 to 1945. At Caltech most of his scientific research focused on the study of cosmic rays (a term which he coined). He died of a heart attack at his home in 1953 at the age of 85.
2015-04-07
East News
Science Source
Science Source
BU9948
1,36MB
26cm x 37cm by 300dpi
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