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The Atom
Beginning of paper
AP Physics Period 2
In the spring of 1897 J.J. Thomson demonstrated that the beam of glowing
matter in a cathode-ray tube was not made of light waves, as "the almost
unanimous opinion of German physicists" held. Rather, cathode rays were
negatively charged particles boiling off the negative cathode and attracted to
the positive anode. .... Middle of paper
.... was much more massive
remainder that was positively charged, Thomson went on in the next decade to
develop a model of the atom that came to be called the "plum pudding" model.
The Thomson atom, "a number of negatively electrified corpuscles enclosed in a
sphere of uniform positive electrification" like raisins in a pudding, was a
hybrid: particulate electrons and diffuse remainder. It served the useful
purpose of demonstrating mathematically ....
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Number of words: 1577
Number of pages: 6 (approx. 250 words per double-spaced page)
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