S10P1CLec28A

S10P1CLec28A - Physics 1C Lecture 28A"I ask you to look...

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Physics 1C Lecture 28A "I ask you to look both ways. For the road to a knowledge of the stars leads through the atom; and important knowledge of the atom has been reached through the stars." --Sir Arthur Eddington
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Quiz 4 Info It will be a Scantron test that covers Chapters 24 and 25. A list of equations, constants, and conversions will be provided on the quiz. You are to write the version of your test on the Scantron form. You will use the Quiz Code Number that you were assigned at the Frst Quiz. You are expected to abide by UC Policy on Integrity of Scholarship.
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Atomic Physics The study of quantum mechanics led to amazing theories as to how the subatomic world worked. One of the Frst theories of how the atom was composed was the Plum Pudding Model (incorrect!!!). In this model the atom was thought to be a large volume of positive charge with smaller electrons embedded throughout. Almost like a watermelon with seeds.
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Atomic Physics Most of the alpha particles passed directly through the foil. A few alpha particles were deFected from their original paths (some even reversed direction). But then in 1911, Ernest Rutherford performed an experiment where he shot a beam of positively charged particles (alphas) against a thin metal foil.
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Atomic Physics He predicted that the electrons would orbit the nucleus like planets orbit the sun. Centripetal acceleration should keep them from spiraling in (like the Moon). Thus, his model was named
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S10P1CLec28A - Physics 1C Lecture 28A"I ask you to look...

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