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sometimes in problems of energy or time uncertainity we use the value of energy of the particle/system to calculate the delta t. Now what are those cases specific examples, where we can apply this?

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  • $\begingroup$ can you give an example or a link where this has been used? $\endgroup$ – anna v Jul 26 at 17:21
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It never makes sense to use an absolute energy in this context. Absolute energies can differ by any arbitrary additive constant.

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