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When do you use Quantum Mechanics? [duplicate]
Given a problem, how does one know whether to use quantum mechanics or classical mechanics?
Take for example electron scattering from a nucleus. The electrons are given a wavefunction in this case. ...
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When to use Quantum Mech.? [closed]
Is there any parameter (in terms of physical quantities such as mass, length, charge...) which can be used to decide when to treat a system quantum mechanically and not classically?
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