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//Ex18_5 Pg-947
clc
d=5*10^(-6) //thickness of silicon in m
Dc=3.4*10^(-3) //diffusion coefficient in m^2sec^(-1)
t=d^2/(2*Dc) //time taken to diffuse
printf("Time taken to diffuse = %.1f*1e-9 sec",t*1e9)
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