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+//Chapter 3_Semoconductor Devices Fundamentals
+//Caption : Resistivity
+//Example3.2: A Sample of Si is doped with 10^17 phosphorus atoms/cubic cm. What is its resistivity? Given Un=700square cm/v-sec.
+//Solution:
+clear;
+clc;
+function Res=resistivity(u,n)//n:doped concentration=10^17 atoms/cubic cm,  u: mobility of electrons=700square cm/v-sec.
+    q=1.6*10^-19 //q:charge
+    Res=1/(q*u*n)// since P is neglegible.
+    disp('resistivity of the si doped with     n-dopant is:')// include ";" at the time of calling
+    disp('ohm-cm',Res)
+endfunction
+// after executing calling resitivity( u=700 and n=10^17)i.e.,                      resistivity(10^17,700);
+// Result: Resistivity of the Si doped with n-dopant is : 0.089 ohm-cm(approx)
+\ No newline at end of file