Lecture_21

Lecture_21 - Lecture 21-1 Lecture Discovery of the Nucleus...

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Lecture 21 Lecture 21 -1 Discovery of the Nucleus In 1911, Rutherford did an experiment where he shot alpha particles through a thin sheet of gold, and found that some of them are deflected by more than 90 degrees. This is not possible in the plum pudding model! “it was almost as incredible as if you fired a fifteen- inch shell at a piece of tissue paper and it came back and hit you.” – E. Rutherford Solar system model of the atom
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Lecture 21 Lecture 21 -2 Failed Models of the Atom ¾ The first model of the atom is called the “plum pudding” (or Thomson) model : ¾ Solar system model of the atom Discovery of the nucleus by Rutherford experiment Why do the accelerating electrons not radiate their energy away? Why the discrete emission spectra?
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Lecture 21 Lecture 21 -3 The Bohr Model ¾ The solar system model left unanswered questions: ± Why do the orbiting electrons not radiate and lose energy, leading to the collapse of the atom ?
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Lecture_21 - Lecture 21-1 Lecture Discovery of the Nucleus...

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