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Wavelength of an electron

  1. Sep 23, 2013 #1
    1. The problem statement, all variables and given/known data
    What is the corresponding wavelength, in meters, of an electron moving at 1 m/s?
    Velocity: 1 m/s
    Planks Constant = 6.626 069 57 x 10^-34
    Mass of electron = 9.109 382 91 x 10^-31
    Momentum = unknown
    2. Relevant equations
    We need to find momentum to use De Broglie's equation.

    Momentum = Mass * Velocity
    De Broglie's Equation for finding the wavelength: λ = h/p
    h being the planck constant


    3. The attempt at a solution

    My attempt.

    Finding momentum : P = 9.109 382 91 x 10^-31 * 1 m/s
    p = 9.109 382 91 x 10^-31
    finding the wavelength
    First divide the numbers WITHOUT the exponent
    so 6.626 069 57/9.109 382 91 = 0.727 389 51
    now exponents -34/-31
    = -3 (I took out the extra steps)

    final answer λ = 0.727 389 51 x 10^-3

    is this correct?
     
    Last edited: Sep 23, 2013
  2. jcsd
  3. Sep 23, 2013 #2

    rude man

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    No.
    How did you get from 0.727 389 51 to .0727 389 51 ?
     
  4. Sep 23, 2013 #3
    Oh crap ! MY bad human error it is a typo!
     
    Last edited: Sep 23, 2013
  5. Sep 23, 2013 #4

    rude man

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    Thought so! But instructors mark off for those too! :smile:
     
  6. Sep 23, 2013 #5
    Haha I will be more weary next time! So does the math look off? :tongue:
     
  7. Sep 23, 2013 #6

    rude man

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    Math is fine.
     
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