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Homework Help: Formula relating to Uncertainty Principle

  1. Oct 20, 2012 #1
    1. The problem statement, all variables and given/known data

    I was looking at a solution inmy notes which begins:

    ΔE = hc/λ -1st eqn

    ΔEΔt ~ (h-bar)/E -2nd eqn
    Δt ~ (h-bar)/ (hc/λ)
    Δt ~ λ/2∏c

    (where 'c' is the speed of light)

    What formula has been used to go from:

    Δt ~ (h-bar)/ (hc/λ)
    Δt ~ λ/2∏c

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Oct 20, 2012 #2


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    It's just simplifying. To divide by a fraction, flip the fraction over and multiply. h-bar = h/(2pi).
  4. Oct 20, 2012 #3
    Cheers for that TSny...!
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