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Homework Help: Finding the mean free path using the given values?

  1. Oct 18, 2016 #1
    1. The problem statement, all variables and given/known data

    The concentration of electrons per unit volume is given (atoms/m^3), temperature is also given in Kelvins (100 K). Other values were also given such as valence but I'm pretty sure that they are irrelevant.
    2. Relevant equations
    λ = 1/ pi * d^2 * n
    3. The attempt at a solution
    n is given but I can't find other relevant values to be inserted in the equation since d is missing and the problem didn't provide it. On the second equation, pressure is missing but I don't know if I can assume that the pressure is 1 atm.
  2. jcsd
  3. Oct 18, 2016 #2


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    I assume we are dealing with some random distribution in space of identical bodies, and you want the mean distance one could travel in a straight line without striking another. What parameters do you think will matter?
  4. Oct 18, 2016 #3
    Ok, I just found out that conductivity is also given which I can finally derive mean free path by using mobility and relaxation time.
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