- #1
LarryS
Gold Member
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A beam of light from a laser projected on a screen with a very small hole in it will spread after it traverses the pin hole because of the HUP: Measuring position so accurately causes loss of information about the momentum. I believe that in the case of laser light, only information about the momentum vector’s direction is lost. The magnitude of the photon’s momentum vector is still precise because the photon’s energy is still precise.
If that is correct, then why is it correct? In general, there is nothing in the HUP that allows the momentum magnitude to remain precise.
If that is correct, then why is it correct? In general, there is nothing in the HUP that allows the momentum magnitude to remain precise.