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U6 reading

Last updated almost 5 years ago

4 questions

https://history.aip.org/history/exhibits/electron/

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Question 1

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1. First Experiment: Thomson directed the beam at an electrometer and tried to separate the evidence of charge from the path of the beam. What connection did Thomson find between charge and the cathode rays? Was the charge positive or negative?

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Question 2

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Second Experiment: Thomson tried passing the cathode ray through an electric field. How did cathode ray beam behave when it passed through an electric field? What did he conclude after his second experiment?

Question 3

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Third Experiment: Thomson did some careful measurements on how much the path of the cathode ray was bent in a magnetic field and how much energy they carried. From this work Thomson could describe the mass/charge ratio of the cathode ray particles. What amazing result did Thomson find?

Question 4

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Thomson’s Atomic Model: Thomson presented three hypotheses from his experiments. Only two were accepted by physicists – in fact the third was shown to be wrong! From the first two came a model of the atom known as the Plum Pudding model. Complete the atom drawing below to illustrate Thomson’s plum pudding model. Explain how this fits with his observations.