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Can the variational method be used to calculate energy states when there has been a disturbance to the system?

Can the variational method be used to calculate energy states when there has been a disturbance to the system? Correct Answer No, because new iterated functions rely on previous functions that do not include these disturbances

Disturbances can change energy levels significantly and this must be considered. A new method called Perturbation theory is used to account for these disturbances. It is a modification of the variational principle.

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