Recent content by jack7992

  1. J

    How to Determine the Total Cross Section for an Isotropic Reaction?

    Homework Statement A thin (1mg/cm^2) target of 48-Ca is bombarded with a 10-nA bean of alpha particles. A detector, subtending a solid angle of 2E-3 steradians, records 15 protons per second. If the angular distribution is isotropic, determine the total cross section, in mb, for the reaction...
  2. J

    How Do You Calculate the Number of Steps in a Random Walk?

    right, but I was thinking more along the lines of total distance traveled, as in if you walk a mile one way and then come back on the same path, the total distance traveled is two miles, but the total displacement, if you will, is 0. I thought the former is what he was asking about. But I guess...
  3. J

    How Do You Calculate the Number of Steps in a Random Walk?

    first, is your initial equation right. L= N^(1/2) * l ? That doesn't make sense. I think that should be L = N * l, i.e. if you take 3 steps of 5 units each step, the total distance traveled is 15 units.
  4. J

    What Happens if Masses are Negative in Newtonian Potential?

    Homework Statement Imagine that you have two particles with masses m and M, interacting with the standard Newtonian potential V=-G*m*M/r . When both masses are positive, you have a textbook example of central force motion. What happens if masses are negative? Discuss the cases 1) m<0, M<0; 2)...
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