We often say that the conservation of the energy could be violated by a quantity $\Delta E$ but only within a precise interval of time $\Delta t$, dictated by the Heisenberg principle ($\Delta t \lesssim h/\Delta E$). But in the Heisenberg principle it seems that the $\Delta t$ should be greater, not lesser, than this: $$ \Delta t \cdot \Delta E > h/4\pi.$$ How could I explain all this in plain words to my students?
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