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Homework Help: De Broglie wavelength question

  1. Apr 4, 2009 #1
    1. The problem statement, all variables and given/known data

    In one of the classes, a recent experiment showing the interference of C60 molecules using a double slit apparatus was discussed.

    (a) If the average velocity of the C60 molecules is v= 200 m/s, calculate the De Broglie wavelength for a C60 molecule

    2. Relevant equations

    lamda = h / p

    where p = mv

    3. The attempt at a solution

    so m = 12 x 60 / 1000 to convert into kilograms.

    p = m x v = 144

    lamda = 6.63 x 10^-34 J.s / 144 kg m/s= 4.604 x 10^-36 m

    Now that does not seem right because you can hardly see a wavelength that small. Is something wrong with what I have done.

  2. jcsd
  3. Apr 4, 2009 #2


    User Avatar
    Homework Helper

    Calculation of mass of C60 is wrong.
    It is 12X60 amu.
    1 amu = ...kg ?
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