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+// Exa 4.17
+clc;
+clear;
+close;
+// Given data
+e= 1.6*10^-19;// in C
+Eg= 0.75*e;// in J
+h= 6.62*10^-34; // in Js
+c= 3*10^8;// in m/s
+n=90/100;
+// Formula Eg= h*c/lamda
+lamda= h*c/Eg;// in m
+lamda=lamda*10^9;// in nm
+R= n*lamda/1248;// in A/W
+disp(R,"Responsivity in A/W is : ")