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Lecture 4

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University of Toronto Mississauga
Thottackad Radhakrishnan

Lecture 4 Monday, 13 January, 2014 11:02 AM Today's Topics: Announcements: Homework:  The Bohr model  Office Hours today: 3-4:15pm Experiment 1 prelab  Standing waves  Labs begin this week  Print out feedback forms from blackboard and bring to lab Lecture Topic: Know the solution to the problem from last week as it is very representativefor this kind of problem:   Bohr Model (1913)  Circular orbits of electrons around a central nucleus of protons  Quantization of orbital angular momentum  Principle quantum number, n Standing Waves  In physics, a standing or stationary wave is a wave that remains in a constant position ○ It persists, and does not die down ○ Its nodes and antinodes do not move ○ There can be an indefinite number of nodes in the closed distance of the wave  In a restricted system,the condition must be satisfied ○ n must be an integer  The wave property of electrons means this applies to atoms ○ For a stable standing wave to apply, since the length of the wave must be the circumference  Know that    Angular momentum(mvr) is quantized ○ Why can electrons be placed in definite orbits around the nucleus?  means that the
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