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Lect22-Phys172s11-(11.10-11.11-L_quantization,Gyroscope) -...

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Spring 2011 PHYS 172: Modern Mechanics Lecture 22 – L quantization, Gyroscope Read 11.10-11.11 EXAM 3 is next week Time: 8:00-10:00 pm Wed Apr 13th Place: Elliott Hall Material: lectures 15-22 and respective HWs Problems: multiple choice, 14 questions (70 points) write-up part, hand graded (30 points) Equation sheet : provided Practice exam: will be posted Note: no lecture on April 14th Angular momentum quantization Elementary particles may behave as if they have rotational angular momentum Electron may have translational (around nucleus) and rotational angular momenta Angular momentum is quantized Angular momentum quantum = 34 1.05 10 J s 2 h π - = = × Whenever you measure a vector component of angular momentum you get either half-integer of integer multiple of &
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The Bohr model of the hydrogen atom Niels Bohr 1885-1962 1913: electron can only take orbits where its translational angular momentum is integer multiple of , trans C L r p N = × = ± ± ± r ± p
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Lect22-Phys172s11-(11.10-11.11-L_quantization,Gyroscope) -...

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