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Please answer with a short comment: If a single electron in a quantum well has 50%...

Please answer with a short comment:
If a single electron in a quantum well has 50% probability to be in the ground state and 50% probability to be in the first excited state, which value(s) will a measurement of the energy produce? What will happen if the measurement is repeated? How can you express the wave function in Dirac notation?

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