- #1
Potatochip911
- 318
- 3
Homework Statement
Suppose ##n## electrons attempt to move through an ##NPN## transistor, there's a probability that some of the electrons traversing the ##P## area will recombine and and not make it to the other side. The infinitesimal probability in a region dx is given by ##dP=\frac{dx}{\lambda}##. Let ##n(x)## represent the remaining electrons at the point ##x##. Show that if ##n_0## is the initial number of electrons and the ##P## area goes from 0 to L that ##n(L)=n_0e^{-\frac{L}{\lambda}}##
Homework Equations
The Attempt at a Solution
I would think that ##n(x)## would just be the initial number of electrons minus the integral of the probability function from 0 to x times ##n_0##, i.e. ##n(x)=n_0-n_0\int_{0}^{x}dP=n_0(1-\int_{0}^{x}\frac{dx}{\lambda})## but this can't be correct since this is decaying linearly as opposed to the exponential decay in what I'm trying to show.