A quanton really has a position at all times, but quantum mechanics does not allow us to predict that position with certainty at future times as we could in Newtonian mechanics.

Question

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Quantum mechanics fundamentally differs from classical mechanics by stating that particles do not have definite positions or momenta until they are observed. Instead, they are described by a probability wave function, which gives the probability distribution of finding the particle in various locations.

A Quanton Really Has a Position at All Times, but Quantum