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De Broglie wavelength of particle of diameter X

  1. Mar 24, 2010 #1
    1. The problem statement, all variables and given/known data
    In an electrom microscope we wish to study paprticles of diameter about 0.10 µm (about 1000 times the size of a single atom).

    What should be the de Broglie wavelength of the electrons?
    Through what voltage should the electrons be accelerated to have that de Broglie wavelength?

    2. Relevant equations

    3. The attempt at a solution
    I know the equation

    wavelength = h / p,

    but that doesn't seem to get me anywhere, but that's the only equation for the de Broglie wavelength I know. Therefore, I should look for ways to find p by using the diameter of the particle, but a particle's size shouldn't matter towards its momentum.

    So is there are a couple of equations I'm missing, that can get me from the one given quantity of diameter to the wavelength?
  2. jcsd
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