'''Problem 6''' (T6.12):  You can use assumptions made in T6.7.  You do NOT need to work out T6.7.  This problem is rather self-contained.  It would be important to take into consideration of the temperature dependence of mobility (see programming solutions for HW 6 for how to do it — see Exercise T3.1 for the full detail).  Exercise T6.1 would be helpful, as well. 
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