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Unformatted text preview: PHY251 Homework Set 9 Reading: Chapter 10, with exception of Sections 10-5 and 10-6 Homework: Chapter 10, Question 4, Problems 1,3,5,6,7,11 Hints and Solutions Question X.4 (10 points) According to the exclusion principle, in any system involving more than one electron, the wavefunction of the system must be anti-symmetric under the interchange of the coordinates (and spin labels) of any pair of electrons. At the same time, it does not appear reasonable that in describing the 2 p state of the electron in New York, it should be necessary to take into account the wave function of an electron in the ground state of hydrogen located on the Moon. Give an argument as to why we can forego antisymmetry in this instance. When does antisymmetry need to be taken into account? Hints: See Problem 4. Solution: No Solution yet Problem X.1 (15 points) Show that for the case of two particles in an infinite well, N A = N S =2 in Eqs....
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