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Homework Help: Generalised uncertainty Principle Can't get rid of the i?

  1. May 6, 2015 #1
    1. The problem statement, all variables and given/known data


    3. The attempt at a solution

    As you can see where I have got up to... However I am stuck... In the solution there is no i. In mine there will be. I am unsure how you make the complex number drop out at this stage. I think I'm missing a mathematical trick here...

    The solution should be: greater than or equal to (5h(bar)^2)/2. Clearly I am going to have an erroneous complex number in here...


  2. jcsd
  3. May 6, 2015 #2


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    The notation ##|\cdots|## refers to the complex modulus, so you automatically have ##|i|=1##.
  4. May 6, 2015 #3
    That's a bit embaressing... It is nearly 4am so let me off that one! Was reading it as the normal modulus making everything positive!!!

    thanks - though, I was sititng scratching my head for half an hour at that.
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