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Homework Help: Electron achievable resolution?

  1. Jul 8, 2007 #1
    Electron...achievable resolution???

    1. The problem statement, all variables and given/known data
    An electron is confined inside a sphericial region of diametre 1.5nm.The speed of the electron is measured. Which of the following is not an achieveable resolution for the measurement?

    A +/- 9.7*10^3 ms^-1

    B +/- 3.86*10^4ms^-1

    C +/- 7.72*10^4ms^-1

    D +/- 1.21*10^5ms^-1

    E +/- 1.54*10^5ms^-1


    ANSWER = A


    2. Relevant equations

    Im not sure really, since I dont know how to attempt this question, I think either the debroglie wavelength or uncertainity principle, but to be honest,I dont really know what to use.

    3. The attempt at a solution
    I dont have a clue, would someone be able to at least start me in the right direction, thankyou.
     
  2. jcsd
  3. Jul 8, 2007 #2
    use the uncertainty principle delta(x)*delta(p)<h bar. You have delta(x) which is the width, so find delta(p) and delta(p)= mass * delta(velocity) => possible resolution.
     
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