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+//chapter 6 example 2//
+clc
+clear
+//quantum efficiency=n,number of hole pairs generated=re,number of incident photon=rp,responsivity=R,charge of the electron=e,speed of the light=c//
+re=1.5*(10^11);
+rp=3*(10^11);
+n=re/rp;//quantum efficiency//
+printf("\n quantum efficiency=%f m\n",n)
+e=1.6*(10^-19);
+l=0.85*(10^-6);//in mts//
+c=3*(10^8);//in mts/sec//
+h=6.62*(10^-34);
+R=(n*e*l)/(h*c);
+printf("\n responsivity of the photo diode=%f AW-1\n",R)