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## Main Question or Discussion Point

Hi, I was just wondering if heisenbergs uncertainty principal is about position and velocity (or energy and time),.. then how come we can know that a photon travels at light speed (its velocity) exactly and also know that it hit some detector (its position).

If we know the velocity exactly then the light must be everywhere at the same time right?

If we know the velocity exactly then the light must be everywhere at the same time right?