1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper
    Gold Member
    2017 Award

    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...!
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook