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# hw1_002 - PHY 4604 Fall 2009 Homework 1 Due at the start of...

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PHY 4604 Fall 2009 – Homework 1 Due at the start of class on Friday, September 4. No credit will be available for homework submitted after the start of class on Wednesday, September 9. Answer all four questions. Please write neatly and include your name on the front page of your answers. You must also clearly identify all your collaborators on this assignment. To gain maximum credit you should explain your reasoning and show all working. This assignment is primarily designed to provide practice with standard mathematical tech- niques encountered in wave mechanics. You may find useful the following integrals: Z cos 2 x dx = 1 4 sin 2 x + x 2 , Z 0 x 2 n exp( - x 2 /a 2 ) dx = π (2 n )! n ! a 2 2 n +1 . In the second equation, a is real, n is a non-negative integer, and n ! = n · ( n - 1)! with 0! = 1. 1. A point-like particle of mass m moving in one dimension is confined between hard walls at x = ± a/ 2. The particle is described by the wave function Ψ( x, t ) = ( A cos( πx/a ) exp( γt ) for | x | < a/ 2 , 0 otherwise . (1) Here a is a real length, while A and γ are constants that can be real, imaginary, or complex.

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hw1_002 - PHY 4604 Fall 2009 Homework 1 Due at the start of...

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