Question

When we force protons through a narrow slit, we are gaining certainty in their position. As we gain certainty in their position, what should happen to the certainty on momentum?

Answers

Google Heisenberg uncertainty principle

certainty of product of position and momentum is limited so the more accurately you know position the less accurately you know momentum
eg:
http://ocw.mit.edu/courses/electrical-engineering-and-computer-science/6-007-electromagnetic-energy-from-motors-to-lasers-spring-2011/lecture-notes/MIT6_007S11_lec38.pdf

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