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Jun 29, 2017 · Because like charges repel each other and opposite charges attract, Thomson concluded that the particles had a net negative charge; these particles are now called electrons. Most relevant to the field of chemistry, Thomson found that the mass-to-charge ratio of cathode rays is independent of the nature of the metal electrodes or the gas, which ...
- The Start of Jj Thomson
- How Thomson Discovered Electrons: Trials and Errors
- Thomson’s Conclusion
- References
A short history of Thomson: Joseph John Thomson, JJ on papers, to friends, and even to his own son, was born in Lancashire, England to a middle class bookseller. When he was 14 years old, Thomson planned to get an apprenticeship to a locomotive engineer but it had a long waiting list, so, he applied to and was accepted at that very young age to Owe...
Why did J. J. Thomson discover the electron in 1897? Well, according to Thomson: “the discovery of the electron began with an attempt to explain the discrepancy between the behavior of cathode rays under magnetic and electric forces.” What did he mean by that? Well, a cathode ray, or a ray in a vacuum tube that emanates from the negative electrode,...
A student of Thomson’s named C. T. R. Wilson had experimented with slowly falling water droplets that found that the charge on the corpuscles were, to the accuracy of the experiment, the same as the charge on a charged Hydrogen atom! Thomson concluded that his corpuscles were just very, very, tiny, about 1,700 times smaller then the Hydrogen atom. ...
the current number is 1,836 but Thomson got pretty close p 14 “Flash of the Cathode Rays: A History of JJ Thomson’s Electron” Dahl Thompson, J.J. Recollections and Reflections p. 2 Referred to in Davis & Falconer JJ. Thompson and the Discovery of the Electron2002 p. 3 Thomson, Joseph John Recollections and Reflections p. 98 quoted in Davis, E.A & F...
- Kathy Joseph
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Thomson's result was. e/m = 1.8 10-11 coulombs/kg. The particle that J.J.Thomson discovered in 1897, the electron, is a constituent of all the matter we are surrounded by. All atoms are made of a nucleus and electrons.
Based on his observations, here is what Thomson proposed and why: The particles are attracted by positive (+) charges and repelled by negative (−) charges, so they must be negatively charged (like charges repel and unlike charges attract); they are less massive than atoms and indistinguishable, regardless of the source material, so they must ...
Dec 11, 2018 · Why did Thomson conclude from this experiment that the negatively-charged cathode rays were made of particles, and hence the discovery of the electron? Why did this force him to conclude that the rays were really particles?
He finally proved atoms consisted of smaller components, something scientists puzzled over for a long time. Thomson called the particle “corpuscles”, not an electron. George Francis Fitzgerald suggested the name electron. Why was the discovery of the electron important?
From these equations we get. (1/2) ( m/e) v2 = W/Q . v = 2W/QI , m/e = I 2 Q/2W. Thus, if we know the values of Q, W, and I, we can deduce the values of v and m/e. To measure these quantities, I have used tubes of three different types. The first I tried is like that represented in fig. 2, except that the plates E and D are absent, and two ...
