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Semiconductor problem - Rearranging terms.

  1. Apr 10, 2015 #1
    1. The problem statement, all variables and given/known data
    Determine values for beta the constant of proportionality for a semiconductor.

    2. Relevant equations
    Given below.

    3. The attempt at a solution

    6zRv3V1.jpg

    I
    m struggling with line 2 to line 3 of the solution. The problem I'm having is I cant see where the squared exponential term has gone. I've tried multiplying out beta and collecting terms in terms of the exponential term, but I'm stuck with the squared expontntial term that would be there. Any ideas on what he has done would really help at this point.
     
  2. jcsd
  3. Apr 10, 2015 #2

    RUber

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    Homework Helper

    I don't see any squared exponential. I see exp(k) times exp(-k) which is one.
     
  4. Apr 10, 2015 #3

    Good point. Dont know what I was thinking, thanks very much for your help!
     
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