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Homework Help: What does "minimum range of uncertainty" mean in QM?

  1. Oct 1, 2015 #1
    1. The problem statement, all variables and given/known data

    The problem on where the photon will hit a screen, after passing through a single horizontal slit.

    I know the wavelength, slit width, magnitude of momentum of incoming photon (calculated), and distance between screen and slit.

    2. Relevant equations

    I just don't understand what the question is asking. What does minimum range of uncertainty mean?
  2. jcsd
  3. Oct 2, 2015 #2


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    If you send a bunch of photons through the slit, you'll get a spot on the screen. The problem is essentially asking you to find the size of that spot. There's a limit to how small the spot will be because of the uncertainty in the component of the photon's momentum parallel to the slit.
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