ps07 - Quantum Mechanics Problem Sheet 7(Solutions are to...

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Unformatted text preview: Quantum Mechanics Problem Sheet 7 (Solutions are to be handed in for marking before the lecture on Monday, 7 Mar 2005) 1. In a harmonic oscillator potential V ( x ) = mω 2 x 2 / 2 the wave function of the ground state is φ ( x ) = mω π ¯ h 1 / 4 exp- mωx 2 2¯ h , and the wave function of the first excited state is φ 1 ( x ) = mω π ¯ h 1 / 4 r 2 mω ¯ h x exp- mωx 2 2¯ h . (a) Calculate the mean position h ˆ x i , the mean square position h ˆ x 2 i , the mean momentum h ˆ p i , and the mean square momentum h ˆ p 2 i in the ground and first excited states. (b) Use your results to determine the standard deviations of position and momentum, Δˆ x and Δˆ p , in these two states and check whether the uncertainty relation is satisfied. One of them is called a “minimum uncertainty state”. Which one, and why? (c) Determine the expectation values of kinetic and potential energies, h ˆ T i and h ˆ V i for these two states....
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This note was uploaded on 08/12/2008 for the course PHYS 252 taught by Professor Pocanic during the Spring '02 term at UVA.

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