For 10 points, name this key principle of quantum mechanics named for a German physicist.
The paper which introduced this experiment used the thought experiment of a gamma-ray microscope. This statement arises when there is a non-zero commutator of any two observables, such as energy and time. The term "h over 2 pi" appears on one side of the inequality involved with this statement, which is fundamental to the Copenhagen interpretation. This principle states that a particle's position and momentum cannot be both accurately measured. For 10 points, name this key principle of quantum mechanics named for a German physicist.
The paper which introduced this experiment used the thought experiment of a gamma-ray microscope.
{Heisenberg Uncertainty} Principle [or {Heisenberg Indeterminacy} Principle; prompt on partial answer]