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+//Example 7.11 // Multiplication factor
+clc;
+clear;
+close;
+//given data :
+eta=80/100;// quantum efficiency
+e=1.6*10^-19;
+lamda=.88*10^-6;// in m
+h=6.63*10^-34;//
+c=3*10^8;
+I=12;// in micro-A
+R=(eta*e*lamda)/(h*c);
+P0=0.6*10^-6;// in W
+Ip=P0*R*10^6;
+M=I/Ip;
+disp(M,"Multiplication factor,M = ")