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Unformatted text preview: Homework #4 — PHYS 623 — Spring 2011 Due Monday, FEB282011 at 10:00 a.m. in class Professor Victor Galitski Office: 2330 Physics Class webpage: http://terpconnect.umd.edu/ ∼ galitski/PHYS623/ . Write clearly your name and the homework number and staple the pages together. Teaching Assistants: • Meng Cheng; Office: PHS2113, Tel: 301.405.7299 , Email: [email protected] • Joe Mitchell; Office: PHS3117, Tel: 405.301.2659, Email: [email protected] Textbooks: J. J. Sakurai and J. J. Napolitano, “Modern Quantum Mechanics” L. D. Landau and L. M. Lifshitz, Vol. III: “Quantum Mechanics NonRelativistic Theory” Sudden perturbations. Transition probabilities. 1. Fifty thousand Rubidium87 atoms are confined in a threedimensional harmonic trap and cooled down to nearabsolute zero temperature. The trap frequency is initially ω T = 2 π × 30 Hz, but then, at t = 0, it changes suddenly to ˜ ω T = 2 π × 15 Hz. Assume that all atoms are initially in the ground state and (a) Calculate (approximately) the number of atoms that will be excited by the sudden perturbation ( i.e. , the number of atoms propagated to any excited state in the new harmonic potential). (b) Difficult problem (optional): Estimate the temperature, T f , that the system will have at t → ∞ , when relaxation processes will bring it to equilibrium....
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This note was uploaded on 12/30/2011 for the course PHYSICS 623 taught by Professor Galitski during the Summer '10 term at Maryland.
 Summer '10
 Galitski
 mechanics, Work

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