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https://www.compadre.org/PQP/quantum-theory/prob13_3.cfm Physlet Quantum Physics by Belloni, Christian, and Cox: Problem 13.3 physlet quantum physics belloni https://www.compadre.org/PQP/quantum-theory/section13_7.cfm Physlet Quantum Physics by Belloni, Christian, and Cox: Section 13.7 physlet quantum physics belloni