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first off, when we measure the position of a particles by say, firing a photon at it, its wave function collapses to a spike at the point where the particles was seen..

If we measure the momentum of a particle, its wave function collapses to an oscillating function with the number of oscillations determined by the momentum it was seen to have.

My question is how can we measure the momentum of a particle...that is to say that to measure its position we can fire a photon at it so what can be done to measure its momentum?