- Is quantum uncertainty intrinsic to physical reality or a measure of our ignorance?
I realize that it is impossible to know both the speed and position of a particle because of the uncertainty principle. I also know that this is because if you send a photon at the particle to detect its position you alter its momentum. But does that mean that when you measure position it has no momentum? Or when you measure its momentum it has no position? OK maybe that is a stupid question and only intelligent questions are allowed but doesn't that defeat the whose purpose of this site? Please do not delete this question. I really want an answer. I am beginning to think that unless you are an actual physicist this site is useless. I posted a similar question and it was deleted because I was told the question was stupid!