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Which other variable pairs (other than momentum and position) are important observables in Heisenberg’s uncertainty principle?

Which other variable pairs (other than momentum and position) are important observables in Heisenberg’s uncertainty principle? Correct Answer Energy and time

Substituting E = hv in Heisenberg’s uncertainty principle for position and momentum gives an expression in terms of energy and time as another variable pair that appears in this uncertainty principle. Momentum and velocity, time and position, and energy and momentum are not complementary pairs in this regard.

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