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Homework Help: Doublie slit w/ electron problem

  1. Dec 21, 2011 #1
    1. The problem statement, all variables and given/known data

    In a Young’s double-sit experiment performed with electrons, the two slits are
    separated by a distance of 2.0 x 10^-6m. The first-order bright fringes are located
    on the observation screen at an angle of 1.6 x 10^-4 degrees. Find the wavelength
    and momentum of the electrons.

    2. Relevant equations

    lamda = dsinx/n ?

    3. The attempt at a solution

    So i think electrons display the same properties as light when fired through the doublie slit thingy, thus I just subed 2E-6m for d and 1.6E-4 degree for x and used

    lamda = dsinx

    Answers not right though...and I really don't know where to continue from here.
  2. jcsd
  3. Dec 22, 2011 #2
    come on someone help me please D:
  4. Dec 22, 2011 #3


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    Homework Helper

    What results did you get?

    Last edited: Dec 22, 2011
  5. Dec 22, 2011 #4
    OK nevermind, what I did was right, the teacher made type and give wrong angle, thank you anywayz
  6. Dec 22, 2011 #5


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    Staff Emeritus
    Science Advisor
    Homework Helper

    Glad it worked out.

    FYI, in the future I recommend posting any final result you calculate. Otherwise people have no way of knowing if you did it correctly all the way through to the end.
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