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Particle Collisions

  1. Dec 11, 2016 #1
    1. The problem statement, all variables and given/known data
    You have two samples of the same gas in the same size container, with the same pressure. The gas in the first container has a kelvin temperature four times that of the gas in the other container.

    The ratio of number of collisions with the wall in the first container compared to that in the second is:
    A) 1:1
    B) 4:1
    C) 1:4
    D) 2:1
    E) 1:2

    2. Relevant equations
    PV=nRT
    Urms = sqrt(3.R.T/M)
    collisions= m.Urms^2
    Kinetic energy average= 3/2 RT
    3. The attempt at a solution
    I find that n2 = 4n1
    but what I should do after that?
    I tried relating the kinetic energy but it didn't work with me.
    How we can approach to such problems? What rules should we use
     
  2. jcsd
  3. Dec 11, 2016 #2
    It is a bit difficult to help since you don't define the meaning of any variables. Some of them are maybe obvious. But, what is ##m## and ##M##?
    if ##m## is the mass/particle and ##M## is the total you would have ##M/m=n##. However, I would start by putting the expressions for ##U_{\mathrm{rms}}## in the expression for "collisions", leading to an expression for "collisions" depending on ##m/M##.
     
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