Question: A quantum-mechanical system is known to possess only two energy eigenstates denoted by |1) and 2). The system has an observable P. The states

A quantum-mechanical system is known to possess only two energy eigenstates denoted

A quantum-mechanical system is known to possess only two energy eigenstates denoted by |1) and 2). The system has an observable P. The states (1) and (2) are normalized but they are not necessarily eigenstates of P. Given that (1P1) = (1P1) = . The value of matrix element (1|P|2) is: 00 2 01 4 2

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