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Homework Help: Potential step problem

  1. Jan 10, 2017 #1
    1. The problem statement, all variables and given/known data
    Please see attached image. I'm trying to do part (d), then (e) afterwards.

    For (d) I can sketch the graph okay, just trying to calculate T now.

    2. Relevant equations
    T= 4k1k2/(k1+k2)2

    k = ((2m/ћ)2(E-V))½

    3. The attempt at a solution

    I tried substituting in k into the equation for T. But k depends on the mass of the particle, which isn't given in the question. So what can I do here? I guess one option is just finding the point on the graph, but that's not really a calculation.

    Attached Files:

  2. jcsd
  3. Jan 10, 2017 #2


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    Staff: Mentor

    Look carefully at the equation for T after having substituted the equation for k.
  4. Jan 10, 2017 #3
    When I subbed in k I hoped the m's would cancel but I couldn't get them to. Is it just some mistake I'm making - should they indeed cancel?

  5. Jan 10, 2017 #4


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    Staff: Mentor

    It should. You have k's squared both at the numerator and the denominator.
  6. Jan 10, 2017 #5
    Okay, I'll take another look at my working out. Thanks a million!
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